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!
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Someone who achieves the extra unecessary achievements, but does them in a half-ass fashion.
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'.
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When one guy puts his dick underneath another guys Dick from behind, and positions them in a way that resembles an over under shotgun.
“Hey bro wanna make an over under shotgun on this urinal?”
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At a brothel you postion yourself on your hands and knees. She starts at the crack and tougues up to your knob.
''Boy that under and over i got last night was a sloppy one''
The act of getting a blowjob and your butthole fingered at the same time.
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.