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Top definition
Filthy Lava
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
Get a
Filthy Lava
mug for your mate Beatrix.