The phrase comes from everyday Russian slang, where pupsik is an affectionate nickname for a cute person and idi nakhui is a harsh vulgar dismissal. As a standalone audio clip it circulates on soundboards and in short video edits, usually detached from any single known source. Its popularity rests on the language contrast and on non Russian speakers recognising the rude ending from other memes. It is shared mainly as a reaction sound, sent in chats and layered over clips where a sweet setup needs a sudden rude payoff.