Top Definition
An Ultimate Greebster is someone we all know...it is that friend who comes over and will go through your pantry and fridge with absolutly no cognitive thoughts regarding the fact that the food or drinks are not theirs...they rarely will ask and more often than not you let it slip by and never say anything at all...until they leave
"hey roomie Brian said he is going to stop by..."
"awh dude I just got grocery's and what do you know here comes the Ultimate Greebster!"
"oh shit your right...well lets just make him play Halo right when he walks in so his Greebster ass won't eat all our food!"
by IIIIXIII313 November 01, 2007

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