Top definition
A double fisting that incorporates both anal and vaginal penetration. Fists are then pumped in and out in manner similar to that of pistons in a engine.
I gave that filthy sow the piston fisting of her life.
by josh1234 January 03, 2006
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2
The art of shoving one whole fist in a girl's arse and the other in her vagina and ramming them in and out alternately (like a piston system)
I was piston fisting her til she blead
by Tha BIG Daddy H July 26, 2009
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