Booty

Gisèle, pointing to her bum:  "This is my booty. I like my booty."

Gisèle, yanking at her undies:  "My underwear's sticking to my booty."

Gisèle, pointing to my butt:  "Dat's your booty, Mama. 
Me:  "I call it my bum."
Gisèle:  "No it's your booty!!  And here's my booty!!"  (slapping hers.)