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
Top Definition
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

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