Dorsal fin

[Britney]

When you extend your elbow so that it resembles the upper fin of [a dolphin], or shark and [jam it] into your victims back, or scrotum. Mostly done by [bullys] and neighborhood thugs.

[Lanell]

A person who lacks the common sense to participate in any civilized conversation whatsoever but their failure to do so is tremendously hilarious. This is the person that is involved in your group for the sole purpose to get made fun of on a regular basis.
[Horniest] person in your group
Completely brain dead individual
Sassy to the point of hilarity
To be honest this person is just so stupid that he/she thinks that [dorsal fin] could possibly be an insult. I mean seriously, dolphins are one of the smartest animals that we know of today. How could anything remotely involving [a dolphin] be an insult?

[Hina Muqadas]

The act of putting multiple [strap] [ons] on your back, lying down, and having multiple people ride said strap ons, whilst vigorously doing [the worm].