When a person wearing a hoodie is uppercutted in the hood from behind. The resulting inside out hood is flattened, thereby looking like a "shark fin"
OMG TRAVEL SIZE2, Youve been shark finned!
by K Stizzokes December 9, 2006
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When you float on your back in a body of water with an erection that sticks out like a shark finn.
I'm gonna go shark finning around that bitch in the deep end of the pool.
by D-Rye August 5, 2013
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Term derived from Jaws which refers to a womens clitoris that is engorged, peeking out of the labia refering to Jaws fin out of water.
that bitch over there had a huge shark fin.
by IVIunchy January 1, 2005
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The art of tucking ones junk in the upward position exposing a portion above the belt line.
Did you see how hot the substitute teacher was? Yeah dude I had a shark fin all class.
by Goodmag July 9, 2013
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To uppercut someone wearing a hoodie from behind, causing the hood to turn inside out. The resulting "fin" is flattened, and stood up straight.
by K Stizzokes December 11, 2006
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(Noun) Most ultimate of all aquatic curse words, to regarded with great reverence. Oft regarded as the vivacious cunt!, bloody mother fucker!, or you incontinent nincompoop! of the seas. Marine origin. Use sparingly, and with caution around large bodies of water.

Alternate usage- (Plural)

Sharks Fins: Replacement for Egad, Avast, or land-lubbers translation to Camels Humps!
Caught that sharks fin Aquaman with my girl/guy/Atlantic Cod. I knew she/he/it was smellin' a bit fishy.
by Pseudonym Platypuss February 27, 2020
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when a male or female is fingering his or her woman:
he/she places 4 fingers inside the girl with a flat hand resembling a sharks fin. then making wave like motions with the hand when all of the hand other than the thumb is inserted.
shark finned fuck out that bitch last night!
i was hefty shark finning at the weekend
by RamboJambo123 August 11, 2009
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