Someone negative is now out of the picture: That ass is gone! “Mommy, what’s ass?” Another word for butt.
I know Mom has a butt, because everyone has butts, but she said “that butt is gone”, meaning she must have had a second at some point. Concusion: Buttectomy must have been performed, which is an oupatient procedure, thankfully.
"I find her attractive. She must have a penis!"