a blowjob given from the back by tucking the penis behind your legs.
"I pulled my junk behind legs and she gave me a shark fin"
by captain donkey punch May 17, 2010

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Top Definition
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 01, 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 09, 2013

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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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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 December 30, 2015

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Taking a line of cocaine off a great white shark's fin.

Since eating great white shark provides a good adrenaline rush, and so does doing lines of cocaine, doing a line of cocaine off a great white proves a Epinephrine shock.
Hey Sean, instead of a spiff, how about a SharkFin?

I'm already on top of that, took one this morning.

Bro, where was the invite?

My phone ran out of battery and I had no charger.
by El Sol del Nino May 21, 2014

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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.
LOL, Chicklette! You got shark finned!
by K Stizzokes December 11, 2006

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