Definitions by Paco de meah

undertainter 

when a guy is fingering a girl and then pulls out, makes a fist, punches her in the taint, lifts her up with his fist in her vagina, and then slams her to the ground.

"Dude, that girl was being so damn rough, i had to give her an undertainter."

undertainter by Paco de meah January 21, 2007