What does "Yeah, nah" mean?
It usually means no, even though it starts with yeah. The yeah acknowledges what someone has said, while the nah gives your answer or disagreement.
The saying in a sentence
The saying
Yeah, nah
Example
Yeah, nah, I'm not going to his party.
When you use it
Use it with mates to turn down an offer or disagree gently. Your tone and the words that follow help make the answer clear.
When you do not
Use a plain yes or no when clarity matters, especially in instructions or with someone still learning English.