An Ass Cream Sundae is created when one empties a full can of whipped cream in 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.
I can't believe he fixed himself an Ass Cream Sundae on our first date; that bastard cleaned out every damn drop!
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”