Could you tell me how to say 'sounds legit' please? My Japanese is poor


What would be the Japanese slang version of the sarcastic English phrase
"sounds legit" (meaning "yeah sure... I believe you")?

I have come up with seitounaoto. But yeah, not very happy with direct
translation.




I assume what you need is a joking expression which looks affirmative, but
actually works as a sign of disbelief.

I couldn't think of an exact equivalent, but there are several ways to express
sarcasm in a similar situation. Please note that the followings are kind of
net-slang-y or nerdy rather than simply slangy. I honestly recommend
refraining from using these if you really are a beginner in Japanese.

  1. [な、なんだってー!?](http://dic.pixiv.net/a/%E3%81%AA%E3%80%81%E3%81%AA%E3%82%93%E3%81%A0%E3%81%A3%E3%81%A6%E3%83%BC!%3F) (lit: Y...you say whaaat!?)

This is a famous phrase from _MMR_ , a SF-like mystery manga which always
featured many preposterous rumors. This became an internet meme maybe more
than 10 years ago, but this is still popular. Today, although "な、なんだってー" can
be used for something genuinely astonishing, it is typically sarcastically
used in reply to something grandiose and suspicious.

![なんだってー](https://i.stack.imgur.com/gjKSY.jpg)

  2. ワー、スゴーイ (lit: Wow great) ／ ソウデスネー (lit: That's right) ／ etc

Among the [many usages of
katakana](https://japanese.stackexchange.com/q/1930/5010), one role of
katakana is to simulate a toneless, robot-like voice. Using katakana instead
of hiragana for these words implies that the speaker are not really
affirmative nor interested.

  3. (棒)

Adding `(棒)` (from 棒【ぼう】読【よ】み; monotonous voice) after a phrase/sentence
implies the speaker is not saying it honestly.

Examples (B is being sarcastic):

>   * A 「クレオパトラは宇宙人だった！」 B「な、なんだってー（棒）」
>   * A「クレオパトラは宇宙人だった！」
> B「ソウデスネー[ｗｗｗ](https://japanese.stackexchange.com/a/9941/5010)」
>

