Jello-sex Share definition Flag When two very jiggly/obese people have sex, making a jello effect of their fat. Damn, did you see those fatty's having sex? That was some nasty ass jello-sex! Jello-sex by Fang Banger August 7, 2011 0 0 Get merch Get the Jello-sex mug. Buy Now — $32.95 See more merch