Top Definition
The art of sneaking into a frat party for the purpose of taking the most massive grueling shit in the upper tank of the frat house's toilet. That way when they wake up to clean the place in the morning, they are greeted with the most fowl awesomeness that only frat boys deserve.
Dude, I totally dropped a Greek Upper Decker in ZBT this past thursday.

Sweet. Those guys are dicks. You deserve a trophy man!
by The Greek Upper Decker January 10, 2009
7 Words related to Greek Upper Decker

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