When a man is fucking a woman doggystyle and "accidentally" slips his penis into the woman's anus, and she responds by turning her head around, arching her back, and making a sound similar to a dolphin or porpoise - "eeee! eeee!"
Dude, last night I tried to slip it in Katie's ass, and she totally started porpoising - it was hilarious.
by GangstaPornBitch February 9, 2008
Get the porpoising mug."I found out one of my friends is a porpoisephobe. I can't believe she's porpoisephobic, but porpoisephobia is weirdly common."
by Hexpresso April 19, 2018
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by JZoidberg May 1, 2019
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Get the Porposedimic mug.The up-and-down oscillation of a 2022-era Formula One car at speed, which vaguely resembles the kicking motion of a porpoise. This is due to ground-effects sucking the car to the track to the point of it bottoming-out. The sudden loss of underfloor downforce results in the car the car springing back upwards and the process repeating itself several times per second.
by OldiebutBaddie April 27, 2022
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