Top Definition
A sexual position that works out triceps. The man puts his legs up on a low table or a chair while his hands are also on the edge of a different chair. The girl squats over his crotch while he does chair dips simultaneously banging the woman.
Dude, my arms are so sore from doing the upstate tri-thrust with my girlfriend last night.
by VannTheMann March 14, 2011

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