Something you may say as a teen/child what means I can't be bothered or I don't care. Commonly used in the UK.
Person1: guess what?
Person2: ye nan...
Person1: whatever
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Something that is said (usually said by children or teens) to either escape questions or for the sake of it.
Guy 1: Why df did you do this?
Guy 2: Ye nan lmao
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usually an interaction between 2 or more brits, saying that one will stab the others man.
mate 1: american football not real football yeh?
mate 2: thereโs no such thing as american football , you say that again iโll stab ye nan yeh?