cumvulse
to cum so hard that your whole body convulses.
Dinesh cumvulsed so hard when he and Wendy 69-ed that he fell off his red couch.
Cumvulsion
The act of having a convulsion like reaction immediately after having an orgasm. This usually means the orgasm was very very good.
After the orgasm, I began to have a cumvulsion as my body twitched and jerked uncontrollably.
cumvulsions
That blissfull moment during a bj when you start to orgasm and the girl starts sucking harder and your head and legs start involuntary shaking.
You start cumvulsions like your dick is licking a nine volt battery.