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!!!
A die hard Tupac fan and worshipper. A would be groupie (mostly males) if the rapper was still around. Someone (typically very emotional) who view Tupac as a godlike idol that no one should ever talk bad about. Typical pacsexuals get really offended if you say something bad about him and they usually defend Tupac's past actions no matter what.
John: if pac was alive no other rapper could not touch the surface of his greatness.
Rob: there's a lot of great rappers that never got their chance to shine, 2pac gets too much credit.
John: yo shut the fuck up!!! 2pac is the greatest how dare you try to discredit this legend!!! He's the black Jesus of rap!!!!
Rob: you're such a pacsexual calm down!
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).