The Mothers
The name of several different Zappa bands (and even more permutations of those different bands), loosely defined by the 3 syntactual derivations below. The name reportedly means "motherfucker" as applied to a musician's slang term for any musician who could really play well; i.e. "That cat's a motherfucker!".
The Muthers
A pick-up band that FZ employed to play bar gigs in the SoCal desert.