When a girl farts and queefs simultaneously, placing one hand "over" her vagina, and the other hand "under" her legs, on her ass, both in a cup-like position. When said girl farts and queefs, she moves her cupped hands from a closed to open position, thus creating a loud "Over-Under Thunder." This act is common when girls have pajama parties.
Cindy: Uh-oh! I have to fart and queef at the same time! What should I do?
Stacey: You should cut an Over-Under Thunder!
Stacey: You should cut an Over-Under Thunder!
by JasonFatKid November 2, 2012
Patrick decided to be an Over-Under Achiever when he went the extra mile to do his extra credit, even though he already had a 103 percent in his english class. This project was done in a very UNorderly fashion. The rough draft write-up ended up having its title 'rough draft' erased and then replaced with 'Final Project'.
by E-bag March 30, 2010
When one guy puts his dick underneath another guys Dick from behind, and positions them in a way that resembles an over under shotgun.
by spiritual ass November 3, 2019
I questioned my sexuality, because I thoroughly enjoyed the over-under my girlfriend gave me. I filled her mouth up with my salt malt, and her finger smells like shit.
by SmellyNiggerBalls562 October 18, 2021
At a brothel you postion yourself on your hands and knees. She starts at the crack and tougues up to your knob.
by underandover69 February 20, 2014