All basement bums are male. There is no such thing as a female basement bum. If you think you see a female basement bum, it's probably a hooker or a crackhead.
If you believe you may have a basement bum, do not call 911. The emergency operators will simply laugh at you. Instead, call 1-800-BUM-HELP and pray to god that it's not too late...
Guy 2: Hey. What's up?
Guy 1: Dude, come over quick! I think I may have a basement bum in my cellar!
Guy 2: Yeah fucking right, man. I'm not going to mess with that crazy fucker!
Guy 1: Please, I thought we were friends! Just come over real quick and bring your gun.
Guy 2: Ahahahahahaha! Bullets can't hurt a basement bum. You're fucking dead, man!
Guy 1: What should I do?!
Guy 2: Hang up and call 1-800-BUM-HELP quick!
Guy 1: What?
Guy 2: Just do it!! ...Godspeed!
Guy 1: Okay I'll call you ba--AHHHHHHHHHHHHHHHHHH!! HEEEEEEELP!! ...WHAT ARE YOU DOING WITH THAT SCREWDRIVER?!? OH SWEET JESUS!!!!! AHHHHHH!!
Guy 2: Holy shit...