An extremely fit, toned person who goes to the beach alot and makes others feel bad about themselves; the female counterpart of a strong kong
Person 1: OMG look at that person, they're a wavy sissy!
Person 2: Who are you?
Person 1: I'm Trudy Gallini bitch, my grandfather is the creator of the best coconut cream pie!
someone who is the most extreme version of fit
Walter: "I've been going to the gym alot lately, wavy sissy."
Emily: "Walter, you're such a strong kong"