Basement Weasel 

a secluded and introverted person with few social skills who hangs around in the basement of either their house or schools.

plural: basement weasels

a group or congregation of said individuals. usually only friends through magic cards or dungeons and dragons.

those damn basement weasels smell funny, and they're blocking the hall to the drama room.

Basement Weasel by emily adams September 4, 2006