(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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The act of swimming on your back with an erect penis, whilst helicopter dick-ing, to give the the affect of looking like a great white on the prowl
Guy #1: Why is Jim getting arrested?

Guy #2: He was caught shark finning in in the public pool!
by ThreeLegsG June 5, 2015
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When ones penis tip protrudes through a hole in their underwear or clothing, either accidental or on purpose, resembling a shark fin cresting the surface of the ocean.
Tim's rush to leave the bathroom left his penis tip dangling from his open fly, revealing his shark fin to the entire office.
by Twatfacekilla326 October 30, 2015
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Sneaking up behind someone and using four fingers jamming them into their clothed butt crack while screaming "Shark fin" in order to disrupt theiron train of thought
I just totally gave that chick a Shark fin when she was giving me a hard time
by CnDn_bacon90 November 27, 2016
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Verb
To swim backstroke with an erection.
'Did you see Ralph? He was totally Shark Finning it over that lifeguard.'Said Paul.
by SickyMike October 17, 2014
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Inserting a hand (or hands) into a persons orifice. The hand must be oriented in a manner that the four fingers lay on top of each other for the "insertion". The thumb points upward to resemble a sharks fin.
Dick and Fanny were having some quiet time. Fanny grew excited, resulting in Dick delivering a "Shark Fin".
by jama76 October 11, 2011
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