One of the many songs on "South Park: Bigger, Longer and Uncut"
Performed by Terrance Henry Stoot and Phillip Niles Argyle.
Spoken out against by Sheila Broflovski, Which makes up the remainder of the movie.

A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.

Your aunt

also a song from the movie "South Park Bigger, Longer, and Uncut" that Terrance and Phillip sang

Terrance: Shut your fucking face uncle fucka
You're a cock sucking ass licking uncle fucka
You're an uncle fucka, yes its true
Nobody fucks uncles quite like you

Phillip: Shut your fucking face uncle fucka
You're the one that fucked your uncle, uncle fucka
You don't eat or sleep or mow the lawn,
You just fuck your uncle all day long

(Farting noises)
Terrance: Hmm!
(Farting noises)
(More farting noises)
(Laughing)
(Farting noise)

Policeman: What's going on here?
(Farting noises)
Everyone: Fucka, fucka, uncle fucka, uncle fucka, fucka, fucka
Everyone: Ooh
Terrance and Phillip: Shut your fucking face uncle fucka
(Terrance: Uncle fucka)
Terrance and Phillip: You're a boner biting bastard uncle fucka
Terrance: You're an uncle fucka I must say
Phillip: Well you fucked your uncle yesterday
Everyone: (Laughing)
Everyone: Uncle fucka... that's you
U-N-C-L-E fuck you
Uncle fuckaaaaaa...

Phillip: Suck my balls