A supposed form of dancing that bears resemblance to an epileptic seizure.
Quite funny to watch. You laugh at the dancer, not with them. They think they're amazingly cool.
"Haha, some islanders are krumping over there. They look so idiotic.."
"Mate, I think they're having a seizure"
"Don't worry, it's just the 'dancing'"
"Seriously, dude.. Call an ambulance"