When a piece of gelatin or something else moves side to side
Guy 1: bro that jelly is jigglin'
Guy 2: my money jiggle ji-
Guy 1: SHUT THE FU-
The act of placing the penis into a male/female jelly role
I gave her a jelly jiggle.
I consider myself to be a jelly jiggler.
I watched as I made her jelly jiggle.