The Crab People are a race of evil crab-like creatures appeared in the South Park episode "South Park is Gay!".
They ran a show called Queer Eye for the Straight Guy disguised as homosexual men. Their plans of taking over the world by making everyone metrosexual is eventually revealed to Kyle. They wanted to make all the men weak enough so an invasion would be easy. The TV producers said they did it before on the Jeffersons.
They are small and weak.
They have made Kyle, Mr. Garrison, and Mr. Slave as crab people, the reason why the crab people did is unknown.