The Collaborative International Dictionary of English v.0.48:
Bounder \Bound"er\ (bound"[~e]r), n. 1. One who, or that which, limits; a boundary. --Sir T. Herbert. [1913 Webster] 2. One who behaves dishonorably or objectionably; a cad. [PJC]WordNet (r) 3.0 (2006):
bounder n 1: someone who is morally reprehensible; "you dirty dog" [syn: cad, bounder, blackguard, dog, hound, heel] 2: someone who bounds or leaps (as in competition) [syn: bounder, leaper]