Shark fin

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

Shark Fin

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

fins and feathers

a name of a diet where someone will only eat fish and chicken.

Hayley is a fins and feathers

by Willie P January 24, 2007

Shark Finning

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

Shark Fin

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

dorsal fin

The fin on the back (dorsal) side of an aquatic animal such as a fish, dolphin, or shark.

The dorsal fin on that shark is hook shaped

by mimi June 13, 2003

k-fin

a woman with exceptionally large boobs and who is willing to show everyone her areolas.

OMG look at that K-FIN over there!

by Amanda. Duco. October 19, 2008