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Used to explain your attraction to a girl who would not normally be considered hot to anyone else. The beast factor is that one thing about a member of the opposite sex that makes you want to throw them against the wall and fuck the everloving shit out of them, a trait that you just can't explain.
''Dude, Sara is so friggin' fine!''
''Nah man, she's a fucking dog, what are you, blind?''
''Nah man, she's just got my beast factor...''
by Peezy09 May 14, 2009
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