bum1
n.
Brit. informal a person's buttocks or anus.
Etymology
ME: of unknown origin.
bum2
n.
N. Amer. - a vagrant.
- a lazy or worthless person.
- a devotee of a particular activity:
a ski bum.
v.
(bums, bumming, bummed)
- get by asking or begging.
-
(bum around)
chiefly N. Amer. pass one's time idly.
-
(usu. be bummed out)
N. Amer. make (someone) feel upset or disappointed.
adj.
bad; wrong:
not one bum note was played.
Phrase
- give someone the bum's rush
chiefly N. Amer. forcibly eject someone.
Etymology
C19: prob. from bummer.