かよ

particle

expressing doubt; is that so?; really?

Casual sentence-ending particle used mainly by male speakers to express doubt or surprise, often with a falling intonation. Similar to のか but more blunt.

• 本ほん当とうにそんなこと言いったのかよ。

  Did you really say that?

particle

rhetorical question; as if!; no way!

Used to form a rhetorical question implying the opposite, often with a tone of disbelief or sarcasm. Common in casual male speech.

• こんな簡かん単たんな問もん題だいがわからないのかよ。

  As if you don't understand such a simple problem!