Top Definition
noun: A Greekmonster is the same as a greekmonkey(code name for gay anal sex) except the penis that is inserted into the other man's anus has NOT been circumsized..
Wbrasington, you need to buy a stronger brand of condom, your uncircumsized penis bore right through the condom last night while you gave me that Greekmonster and I've been leaking your man sauce all day...
by juggling_coal January 21, 2010
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