Burton Guster (Gus) is the sidekick to Shawn on "Psych." This is a list of his nicknames, as given to him by Shawn.
Ovaltine Jenkins (my personal favorite)
Silly Pants Jackson
Weepy Boy Santos
Schoonie "U-Turn" Singleton
Gus T.T. Showbiz
Burton "Oil Can" Guster
Big Head Burton
Tan (of Black & Tan)
Vernus Lambert Watkins
Convertible LeBaron (it was more of an adjective, not a nickname, but I liked it)
... more to come as the show continues.