Top Definition
An EXTREMELY deep vagina. You could fit your entire arm in. Compared to the deepest part of the ocean, The mariana trench.
Guy 1: Dude, Jessica has The Mariana Trench In her pants!

Guy 2: Did your sumbarine go exploring?

Guy 1: Oh yeah!
by JoJoTheFlyingMonkey May 28, 2010
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