When the sound of one's orgasm most resembles the sounds he/she would make when having a seizure.
Last night my girlfriend had a spasmgasm. I thought a baby seal was dying.
The stinging or tingling sensation created by making too many quarter-circles or half-circles on a video game controller's d-pad.
With the release of Ultimate Marvel vs. Capcom 3, I've been getting really bad fighter's thumb lately.