"Mr. Garrison's Fancy New Vagina" is the first episode in the ninth season of the American animated television series South Park.
At dinner, Kyle asks his parents what a sex change is, and while explaining the term, his mother Sheila insists that cosmetic surgery is an important and legitimate aid for people whose physical appearance contrasts with their self-image.
He demands Biber to change his sex back, but learns that the operation is irreversible, as his former testicles have been transplanted into Kyle's knees to make him taller, and his former scrotum fashioned into Mr. Broflovski's dorsal fin.
Conversely, Mrs. Garrison, having lost her testicles, decides to accept her new gender, while breaking the fourth wall to the audience saying that she is staying a woman.
According to the DVD commentary for "Mr. Garrison's Fancy New Vagina", Trey Parker and Matt Stone came into the season with "basically no ideas".
Eventually, the surgery footage was trimmed to three brief one second shots after Comedy Central disapproved and after the idea of Gerald Broflovski's dolphin operation was brought up.