The episode: “The Legend of Boggy Creek II: And the Legend Continues,” ep. 1006
The riff: Delivered by Crow as two of the film’s protagonists, a doctor and his skinny, dweeby-looking companion, check out the carcass of a deer killed by the Boggy Creek Creature.
The explanation: It’s a mean joke at the expense of poor Tim, who seemingly insisted on being shirtless through much of this film despite his scrawniness. A castrato is an adult male singer whose voice has been preserved in an adolescent state by castration before puberty. This process meant the singer would never undergo the horomonal changes of puberty, resulting in a high-pitched singing voice and unusually feminine appearance. And if this film is to be believed, it makes you really annoying and not very helpful as well.
Novelty factor: I was aware of the term, and thus understood the dig at Tim’s masculinity. But considering the fact that I don’t have much more muscle mass than he does, I’m not sure how it makes me feel.