Why Casual Japanese Sounds So Different

Textbook Japanese teaches you polite speech (敬語, keigo) — the kind you use with strangers, teachers, or at work. But the Japanese you hear between friends is a whole different register: shorter, faster, clipped, and full of filler words. Phrases drop their endings, particles disappear, and expressions exist nowhere in any textbook. That gap is what this deck bridges.

Once you start using casual Japanese naturally, you will notice that conversations become much more relaxed and genuine. Friends stop switching to slow, polite speech for your benefit and start talking to you like a real person.

Casual Greetings & Goodbyes

The formal おはようございます and さようなら have almost no place in friend conversations. Here is what people actually say.

Heyやっほーyahhoo

やっほー！こっちだよ！ — Hey, over here!

How are you?元気？genki

ねえ、最近元気？ — Hey, how have you been lately?

See youまたねmata ne

じゃあ、またね！ — See you tomorrow!

I'll message youまた連絡する！mata renraku suru

今日楽しかった、また連絡する！ — Today was fun, I'll message you!

Making Plans

Note how these use the volitional form (行こう, 遊ぼう) instead of the polite ～ませんか. Between close friends, the shorter, direct volitional is more natural and energetic.

Are you free tomorrow?明日、暇？ashita, hima

明日、暇？遊ぼう。 — Are you free tomorrow? Let's hang out.

Let's hang out遊ぼうasobou

今週末遊ぼう。 — We should hang out this weekend.

Let's go eatご飯行こうgohan ikou

お腹すいた、ご飯行こう。 — I'm hungry, let's go eat.

Let's go for drinks飲み行こうnomi ikou

仕事終わったら飲み行こう！ — After work, let's go for drinks!

Let's go together一緒に行こうissho ni ikou

初めてだから、一緒に行こう！ — It's my first time, let's go together!

Let's take a picture写真とろう！shashin torou

帰る前に写真とろう！ — Before we leave, let's take a picture!

Let's meet againまた会おうmata aou

今日楽しかった、また会おう！ — Today was fun, let's meet again!

Reactions & Expressions

These short reactions are the glue of casual conversation — they show you are listening, engaged, and real. まじ？ alone will get you enormous mileage.

Really?まじ？maji

まじ？！すごい！ — Really?! That's amazing!

No wayうそでしょuso desho

うそでしょ、ありえない！ — No way, that can't be true!

That's niceいいねii ne

いいね、私も行きたい。 — That sounds nice, I want to go too.

I get itわかるwakaru

すごくわかる、私も同じ気持ち。 — I totally get it, I feel the same way.

I seeなるほどnaruhodo

なるほど、そういうことか。 — Ah, I see, so that's how it is.

Just kidding冗談だよjoudan da yo

怒らないで、冗談だよ！ — Don't be mad, I was just kidding!

Wait a secondちょっと待ってchotto matte

ちょっと待って、忘れ物した。 — Wait a second, I forgot something.

Conversation Fillers & Everyday Feelings

ねえ and でさ are the casual equivalents of "hey" and "so anyway…" — they keep conversation flowing. The feeling words (疲れた, 眠い, 暇) are dropped constantly in everyday speech.

Hey / Listenねえnee

ねえ、ちょっと聞いて。 — Hey, listen to this for a sec.

So…でさde sa

でさ、その後どうなったの？ — So, what happened after that?

By the wayていうかte iu ka

ていうか、それ聞いた？ — By the way, did you hear about that?

I'm tired疲れたtsukareta

今日めっちゃ疲れた。 — I'm so tired from today.

I'm hungryお腹すいたonaka suita

お腹すいた、何か食べよう！ — I'm starving, let's eat something!

I'm sleepy眠いnemui

眠い、もう帰りたい。 — I'm so sleepy, I want to go home.

I'm free / bored暇hima

今日暇だから、遊ばない？ — I'm bored today, want to hang out?

4 Tips for Speaking Casual Japanese

1. まじ is your most versatile word

まじ？ (really?), まじで (seriously / for real), まじか (no way / seriously?) — these variations cover shock, disbelief, agreement, and emphasis. It originated as slang but is now completely mainstream casual speech. You will hear it dozens of times per day once you are around Japanese people.

2. Drop です and ます with friends

In casual Japanese, verb endings drop their polite suffixes entirely. 疲れています becomes 疲れた. 行きましょう becomes 行こう. 大丈夫ですか becomes 大丈夫？. The shorter, the more casual. This is not rude — it is what friendship sounds like in Japanese.

3. めっちゃ amplifies everything

めっちゃ is the Osaka-origin word for "super / really / so much" that has taken over casual Japanese nationwide. めっちゃ疲れた (so tired), めっちゃ楽しかった (so fun), めっちゃかわいい (super cute). Drop it in front of almost any adjective and you instantly sound more natural.

4. ～ない？ is a soft invitation

Instead of the direct volitional (行こう = let's go), using ～ない？ (literally "won't you…?") is even softer and more inviting: 食べない？ (want to eat?), 遊ばない？ (want to hang out?). It leaves the door open without pressure — perfect for casual invitations.

Frequently Asked Questions

Is it rude to use casual Japanese with people I just met?

Yes — casual Japanese (タメ語, tamego) is reserved for close friends, family, and people younger than you who have indicated it is okay. With people you have just met, stick to polite forms (です/ます) until the relationship warms up, or until your conversation partner switches to casual first and invites you to do the same.

What is the difference between まじ？ and うそでしょ？

Both express disbelief, but with different energy. まじ？ is curious and surprised — "really? is that true?" うそでしょ is more emphatic — "no way, I can't believe that." うそでしょ literally means "that's a lie, right?" and carries stronger disbelief. Use まじ？ for everyday surprise, うそでしょ for something truly shocking.

What does 暇 mean exactly?

暇 (hima) means both "free time" and "bored." 暇？ can mean "are you free?" (as an invitation) or "are you bored?" depending on context. 今日暇だ means "I have nothing to do today / I'm free." It is almost always used neutrally — not negatively — in casual speech.

How do I know when it is okay to switch to casual Japanese?

The clearest signal is when your Japanese friend starts using casual forms with you — that is an open invitation to match their register. You can also ask directly: タメ語でいいよ？ ("Is casual speech okay?"). Once friends start calling each other by first name or nickname, casual Japanese usually follows naturally.

Sound Like a Real Friend — Study These Phrases

All 25 casual Japanese phrases above are available as a ready-made deck in Onigiri Anki. Study them with native Japanese audio — the intonation and delivery of casual speech is just as important as the words themselves.

Start on Web

Casual Japanese Phrases for Friends: 25 Natural Expressions (2026)