A female condition. When a woman feels both stanky, and fat. Usually around that "time of the month" or just when a woman feels less than desirable.
Mimi: "OMG I feel like such a stankapotamus today...I ate so much at The Bean Barn's bean buffet..."
CiCi: "Oh girl, I feel ya, I'm on the rag and totally feel like a stankapotamus!"