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3.
For white people it means a blowjob

For black people it means a cigarette
So if I give you 20 dollars, you'll give me a lousy?
Sup nigga, can I bum a lousy off you?
by G-O-D July 31, 2006
 
1.
extremely bad or poor
"well, you could see he really felt pretty lousy about flunking me" (salinger 12)
by pbbt September 25, 2007
 
2.
A small amount that's made much of.
Come on, man, just a lousy 2 dollars is all I ask!
by Milt Alwin June 20, 2010