Text slang meaning the end of the conversation.
person 1: no I swear it’s not like that...
person 2: nah uno i ain’t even care anymore🤷🏾 ♂️
Kinda like how in the card game “uno,” when someone calls uno it means the game is almost over. Same thing in a conversation when u want it to end.
Person 1: hey u tryna smash tn?
Person 2: u had ur chance a while ago... uno🤣