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1.
The act of mixing pop rocks and soda in an anus that is pointing straight up in the air. 15 seconds of finger banging and one good fart creates an eruption.
"Damn! It has taken me one week to get that filthy lava off of my new boxers!"
by lovesock August 15, 2008

Words related to Filthy Lava

anus bang filthy finger sex