A derogatory phrase used when a person does something idiotic, incompetent, unintelligent, foolish and or mindless. It implies that the person is mentally disabled or retarded and therefore this is the food they should eat.
Person 1: Bro why did Randall over there just stuff his head in that pile of feces?!
Person 2: I don't know bro but he needs some green jello.
The most delectable treat you can make in Merica’. Seriously, this shit is delicious. Crack open a yard beer of your choice, smear some mustard on your white tank top and enjoy!!
Hay Hank, you making that green jello with hot dogs entree? Fuck yes I am, same shit we had at my sisters wedding. Coincidentally, my wife.
The act of taking a woman and concocting a green jelly (or any color of choice) which is pored into the female's anal cavity and put in a large refridgerator until the jello is in a solid state and is followed by a rim job with a tasty treat.