Top Definition
When you take a piss in a girl's mouth and while she gargles you jerk off in her mouth.
Dude: Hey baby, I heard about this new thing called the "mississippi fish tank", wanna try it?

Babe: Sounds weird? What is it?

Dude: You trust me?

Babe: Mmmm...yeah?

Dude: Open wide then, close your eyes, and try not too swallow.
by shmurban shmactive April 25, 2009

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