The slight tummy bulge just under the belly button on physically fit women resembling the pouch on a female kangaroo. (not to be confused with women in the first months of pregnancy)
guy1: "Wow that chick is hot, too bad she's pregnant."
guy2: "what are you talking about?"
guy1: "look at her stomach."
guy2: "nah that's just her Roo-Pouch."