This is when the man puts chocolate or strawberry syrup on both sides of the womans vagina. Then lays his dick in the ridge of the womans vagina. A third person (its a three some) puts ice cream on the dick then whip cream and more syrup. After all of this the third person licks all of the dessert off the dick and vagina. This is both pleasant for the man and woman.
"Dude... last night J.C. and her sis Mel and I did the banana sundae!" It was so pleasureful! Me, her, and her other sister might do it tonight!