Someone who never leaves their own home, specifically their room.
Have you seen Derek lately?
No, he's a basement monster man. I don't even think he showers.
"My wife and I were in bed, and she gave me basement kisses!"
Someone who spends most of their time in their relatives' basements for their own personal hobby. Linux coders.
"Dan spent all night downstairs coding up the new kernel patch, he's a real basement jockey"
A male over the age of eightteen, usually with no formal education, who continues to live at home with his parent(s) and has no ambition to move out or contribute to society. His will to live is sucked by his daily marijuana regiment. He can be found working second shift at your local gas station. Lives in a perpetual state of "Getting his shit together."
Jonas picked up some sluts from the amoco and brought them back to his dad's house. They thought he was such a bsement dweller.
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A Basement Champion is a stinky nerd that lives in their mother's basement playing video games for more then 12 hours a day every day.
Peter: Hey dude, my guild just beat the Lich King on 25 man Heroic last night! It was so intense, I had to put my keyboard in the dryer after the raid because I was sweating so bad.
John: You are such a fucking Basement Champion, shut up! No one gives a shit about you loot! Go outside and get some sun!
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Describing a person (Usually age 30+) who lives in their parents basement, and would rather play video games such as WoW/Counter-Strike or hang out in online chatrooms/IRC than go out into the real world and have a tangible social life.
In most cases, a poopsock is also a basement virgin.
I have not seen Jeff since World of Warcraft was released, He must have turned into a Basement Virgin.
Jeff! Get off your computer and stop being such a Basement Virgin, or I will stop cooking with cheese.
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A middle aged vagabond who hides in your basement in order to stay out of bad weather. They sit in the dark corners of your cellar until you go down there to get laundry done or bring out the holiday ornaments. Once you do, they attack you with a rusty screwdriver that is infested with diseases.
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 1: Hello?!
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!!
*Dial Tone*
Guy 2: Holy shit...
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