The fin created on one side of your hair/head when you vomit (boot) from drinking too much and then sleep in a pool of it. The fin formation is the result of it drying and creating the ultimate hair spiker.
Man, look at Tim—he's going to have a boot fin in the morning.
Is that hair mousse or a boot fin?
Yesterday I woke up with a boot fin and couldn't remember how I got it.
Is that hair mousse or a boot fin?
Yesterday I woke up with a boot fin and couldn't remember how I got it.
by dragon fan July 06, 2006
What crazy owners call their pet fish, similar to crazy owners calling their cats and dogs “fur babies.”
by Gregor72 February 15, 2021
Fin again
by fin again barbie bin net February 02, 2021
by myrespecthasgonrightdown October 27, 2021
The act in which a girl gives you blue balls and you are so horny that you jerk off on the drive home.
Boy 1: The principals daughter gave me blue balls so bad I had to rub one off on the way home.
Boy 2: That’s called a shark fin!
Boy 2: That’s called a shark fin!
by ashtonpeterson February 14, 2024
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.
by Radel-Held April 03, 2023