yeah, no

Interjection

colloquial emphatic

(emphatic, colloquial) Used sarcastically to answer "no" to a question where the negative answer should have been obvious.

Japanese Meaning

皮肉を込めて、明らかに否定であるべき質問に対して、強調的かつ口語的に否定（「いいえ」という意味）を返す表現です。

Yeah, no, I definitely didn't eat the last slice of pizza.

いや、そんなわけないよ。最後のピザの一切れは食べてないよ。

Sense（1）

(emphatic, colloquial) Used sarcastically to answer "no" to a question where the negative answer should have been obvious.

Sense（2）

an agreement; the “yeah” functions as affirmation, while the “no” could be replaced by the phrase “don’t worry.”

yeah

（ canonical ）