1. One who spends much of his, or her, time in the basement making nitroglycerin-propelled bombs.
2. A lonely recluse.
3. A person that prefers to participate in evil acitivies when unattended, especially one that manages to perform well in academics.
4. One who has been beaten into submission as a child.
Eric: I dunno, man--we've got a lot of potential basement childs at Drew...
Jack: STFU, n00b!