When a fat ass persons arms jiggle so much that Bill Cosby starts singing the jello song.
Look at the jellbos on taht lady.
by steve May 09, 2003
Upper arm fat in the elbow region, resembling jelly in a plastic bag. Commonly found on grossly overweight people.
Dayum! She's got thunder thighs and jellbows!
by The Watcher April 02, 2003