Concise Oxford Dictionary, 8th Ed., Copyright 1991 Oxford Univ. Press

/lousy/ <<"laUzI>> adj. (/lousier/, /lousiest/) 
1. infested with lice.
2. [colloq.] very bad; disgusting (also as a term of general disparagement).
3. [colloq.] (often foll. by "with") well supplied, teeming.