Top definition
A clever turn on a classic prank. The original prank calls for putting plastic wrap over a toliet bowl so when someone goes to pee, it splashes back. The jelly john, furthers this, instead of using plastic wrap, you fill the toliet bowl with a layer of clear gelatin thus making the prank harder to detect an much harder to deal with.

It can be used as either a noun, or a verb.
Lester was pissed off at his room mate, so he gave him the ol' jelly john.

Pete's jeans were all wet around the knees because someone jelly johned his toliet.
by cool4dude November 07, 2005
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