When a person at a concert is trying to
dance and sing along but is incredibly off
beat and usually mouthing the wrong
words. The opposite of jamming.
"I'm never taking
Derek to a concert again. He was jellying all over the place with no sense of direction or rhythm."
"Do you see the
guy with his
hippie girlfriend in front of us?"
"Yeah, he's really spreading out his jelly!"
"Couldn't agree more, man Phish is awesome!"