fifth wheel

A sexual position in which the female has her shoulders on the ground, ass in the air, and her partner penetrates her by approaching from the back and holding her legs in front of him/her, thus replicating the use of a fifth wheel trailer and a truck

Holy shit, did you see that porn star get fifth wheeled in that video? Her shoulders must be hurting!

by unfickwuthable June 14, 2015

Grease a fifth wheel

Greasing up a butthole with lubrication.

1) Jay likes to grease Mike's fifth wheel.
2) You like to grease a fifth wheel

by Jason Vallone November 20, 2005