When you shove a whole Jello mold into a women's vagina (or anus if she is practiced enough) and then you fuck her until the Jello chunks start falling out and have properly discolored your penis.
It was Thanksgiving, so you know I gave my wife a dirty Jello Fetus on the dining room table, but now the family refuses to look either of us in the eye.
When 2 girls and a guy start doing it, one of the girls gets a straw and starts sucking everyone with the straw (tits, pussy, balls, clit, etc.) and then when the guy cums in the girl the one with the straw sucks the jizz out of the girls twat.
derived from sucking Jello out of the cup
from a straw
Dude me and these twofreaky gurls totally did "The Dirty Jello" last night.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.