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.
The act of putting chocolate syrup, whipped cream, a cherry, and sprinkles if you wish on a girl's "down under" and then eating it off and out of her. Ice cream optional, hence it will get a little messy. G'day mate ;)
I had a delcious australian sundae last night with this girl i met at outback yesterday, who works at coldstone.