Hillgasam 

when going over a hill at high speeds and that euphoria feeling overcomes you; you let back your head and sigh going over a hill. Can also be used as an adjective: Hillgasmic

Billy: Dude did we just go over a hill?
Bob: Yea why?
Billy: Cause I just totally just had a Hillgasam

Hillgasam by Zack Wiggins February 12, 2009

hulkgasam 

When a girl has a orgasm and punches you in the face.
Or when a girl has a orgasam and beats the shit out of you.

Russia : Skinny Pete what happened to u?
Skinny Pete: the girl I was with had a hulkgasam.
Russia: damn.

hulkgasam by Liberty Princess February 28, 2016

hellgasm 

When you're having an orgasm, and it feels so overwhelming. Your body feels like it's on fire and hot as HELL.

Oli: Oh damn, last night I was giving Evalynn a hellgasm so bad last night, she fuckin' woke the neighbors up with her screaming!

hellgasm by bmth_is_love March 1, 2009