An Ass Cream Sundae is created when one empties a full can of whipped creamin the ass of their partner (spoon-feeding in a container of Cool Whip is an acceptable substitute contingent on their elasticity) and then proceeds to eat it out.
A sexual act done on Sunday’s where the male shoves a bunch of ice cream into the females asshole and the female then farts it all out into the males mouth and onto the face.
Derek: “Does your girl ever make you an Ice Cream Sundae?”
Xavier: “Fuck yeah, she says the cold ice cream helps her orgasm”