Over Promise Under Deliver

A person that promises much but delivers little or nothing. Common among blowhard, player and douce bag types
Dude: "Hey, you going with Kev to the big game?"
Chick: "Naw, he is such an OPUD; if he says he is gonna get "killa seats" we will end up in the parking lot watching the jumbotron like last time.

Kid1: "Dude, that remote car rocks! Look at the sick tricks it does on the TV!"
Kid2: "Dude, all commercials are OPUDs, that stupid car probably can't even make it up the ramp without camera tricks"
by TedDeadMan August 12, 2010
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