Webster's English Dictionary

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bum

1. bum \'b*m\ n [ME bom] chiefly Brit  : BUTTOCKS 
2. bum vi or bummed;  or bum.ming [ME bumben, of imit. origin] dial chiefly 
   Brit  : to make a droning or murmuring sound : HUM 
3. bum vb or bummed;  or bumming [prob. back-formation fr. bummer] : to go 
   around in a manner of a bum :  : LOAF  : to wander esp. like a tramp  : to 
   obtain by begging : CADGE  - bum.mer n
4. bum n [prob. short for bummer] 1: one inclined to sponge off others and 
   avoid work  2: HOBO, TRAMP 
5. bum aj 1: INFERIOR, WORTHLESS  2: DISABLED {a ~ knee} 
6. bum n [prob. fr. 3bum] : a drinking spree : BENDER