rollergasm
The feeling experienced in your lower abdomen/groin as a Roller Coaster drops from its maximum elevation at high speeds.
I had at least one rollergasm on that roller coaster.
rollergasm
The feeling, had predominitally in males, had during intense periods of a roller coaster ride, occuring mostly in the lower loins.
"I cant believe I just had a rollergasm on the tilt a' whirl!"