When the sound of one's orgasm most resembles the sounds he/she would make when having a seizure.

when you're hungover as shit after a spending a night drunk as a skunk

(n)- To ejaculate uncontrollably during any given time

An involuntary bodily spasm resembling the pleasant sensation of an orgasm in another part of the body that would not usually experience orgasm.

adjectival derivatives:

spasmgasmic
spasmgasmical
spasmicgasmic
spasmicalgasmical

When the sex was so good it takes a few days for your toes to uncurl.

When you spaz so hard you have a orgasm