Fin

A person who fucks their cousins. Maybe they have a three-way with their cousins!

That kid is a Fin! Yo that's disgusting brother.

by Nigg jay May 26, 2018

fin

A guy who has a big dick and likes cheese

M8 my Penises so big, are you called fin the, yes, I also like cheese, well if your called fin then you have a big dick and you likes cheese

by Fin December 10, 2016

shark fin

A mountain bike feature leading into a jump with a lip at a 45 degree angle. Leads to a sideways jump and requires the rider to twist his bike mid-air to prepare for the landing. The feature sticks out of the ground like the fin of a shark that's crossing the trail.

Rider 1: Dude, see me send the shark fin??
Rider 2: Totally. That was sick, bro!

by Radel-Held April 2, 2023