Top Definition
when you are trying to make some sort of contact with another person and they dont answer your phone calls or texts, and you haven't seen them in like three days. They are presumed to be in their basement masturbating.
"dude i haven't seen jordan in like three days"
"yeah man, me neither"
"should we install the basement theory?"
"install it bro."
by paul read May 10, 2009

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