Taken from the SNL "Celebrity Jeopardy" skits, Trebeck is a name assigned to anyone who is the brunt of insults and jokes from and is unable to effectively, counter - usually resulting in setting themselves up for even more insults
"Ah rough, just the way your mother likes it Trebeck!"
Trebeck: "Mr. Connery has set a new Jeopardy record for futility with..."
Connery: "Suck on it Trebeck! Suck it long, and suck it hard!"
Trebeck: That's beautiful. Do you kiss your mother with that mouth?"
Connery: "No, but I did something to your mother with this mouth!"