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Someone who is sexual with everything. Phi (Φ) is a variable and therefore can be replaced with anything, hence a phisexual is someone who is sexual with any and everything.
Mans: Yo guy youz a phisexual
Flamer: WTF, a phisexual?
Mans: Yeah man youz sexual with errything!!!
by juz098 December 24, 2009
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