To trebek is to reference a person to the male genitalia. If a person is being cynical, difficult, or down rightannoying labeling them as a trebek is the equivelent of calling them a ,"Dick."
"Wow, Floyd you are being such a trebek right now."
"Oh man... is your trebek alright? I didn't think I could throw that hard."
"GOD, My boss is such a trebek".
A sophisticated person with salt and pepper hair and a mustache (Although Alex Trebek no longer has the mustache he will always be known for having one)
Dude, you better hurry up and tee off... Alex Trebek back here is gonna have a shit!