Definitions by CarlTheCamel

knuckle tuck 

A knuckle tuck is when one curls up one's finger, tucks said finger into the receiver's anus, and continues to add more and more fingers.

Oh my God, Becky, Bryson knuckle tucked my camel toe for an hour straight.

knuckle tuck by CarlTheCamel March 21, 2016