F*** Yo Jacket
A loud, stupid thing you say to show off when you’re losing, making you look like a total idiot and confusing everyone else.
I yelled 'F*** Yo Jacket!' to my brother after he beat me at chess.
She screamed 'F*** Yo Jacket!' after I showed her I was right, and it made no sense.
He said 'F*** Yo Jacket!' in the middle of a game and got laughed at.