無賴,遊民,遊蕩者
Bummer \Bum"mer\, n. An idle, worthless fellow, who is without any visible means of support; a dissipated sponger. [Slang, U.S.]
bummer n 1: an experience that is irritating or frustrating or disappointing; "having to stand in line so long was a real bummer" 2: a bad reaction to a hallucinogenic drug