An old
couch or mattress left in an alley or vacant lot. These things attract bums
like flies. The
cops know that they can usually find bums there arrest them for warrants, vagrancy etc
Todd: Can you help me move my old
couch into the alley for the trash
truck to pick it up?
Charlie: You don't want to lay out bum bait do you? You'll have some hobo or
junkie sleeping on it by the morning.