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1.
A person who is secretly a nerd, and is afraid to tell anyone.
Bill: Hey have you seen Jimmy?

Ted: Yeah, he's off playing D&D with some freinds, but don't tell anyone because he's totally in the basement.
by ninjarabbi May 10, 2010
 
2.
A dirty add-on to any statement.
Would you hold my cheese?...in the basement...

by Dr. Deers January 19, 2009