This isn't really that important. It's actually really trivial, but...
In the "Tom's Rhinoplasty" episode, when Chef asks boys "Don't you know what a lesbian is?" Kyle responds, "A plebeian?" ("plebeian" is a derogatory term meaning someone is common, crude, low or vulgar; a boor or a peasant.)
Anyhow, I know some of us were wondering how Kyle knew that word and not "lesbian".
Well, I'm not sure if Kyle knows what it means, but I think I know where he picked the word up. In "Death," when Terrance is arguing with Kyle about who can clone something first, Terrance refers to Kyle as a "plebeian."
You're welcome for wasting your time with such useless information.