boundern.

bounder (n.)1560s, "one who sets bounds," agent noun from bound (v.1); British English slang meaning "person of objectionable social behavior, would-be stylish person," is from 1882, perhaps from bound (v.2) on notion of one trying to "bound" into high society, but earliest usage suggests one outside the "bounds" of acceptable socializing, which would connect it with the noun.