Poker slang term. When bragging about your hand's immenent victory, someone calls your bet, beats your hand and drags the pot without saying a word. The poker equivalent of a 'Dirty Sanchez', ala sticking your statement up your ass, then wiping their hand across your lip in humiliation.
"Opie had three Aces, but Cave slipped him a Dirty Quentin when he rolled over him with an Aces over Kings boat."
by Monkeyfuck McGrew February 7, 2005