Pan generally refers to the sexual orientation of someone that can love or be attracted to a person of any sex, not just females or males, including but not limited to males, females, transexuals, tansvestites, gender benders, hermaphrodites, intersexuals, androgenous people, and those with sex-chromosome anomaly such as klinefelter syndrome or turner syndrome.
Girl one: I'm straight.
Girl two: I'm bi.
Girl three: I'm pan.
(so the straight one's pretty much screwed)
((just not literally...))
A nickname for many people.
When people have pan as a nickname, it normally means they are good in bed.
other Dude: why?!?
Dude: CUZ HER NICKNAMES PAN!
other dude: DAMN! I WISH I HAD GOT TO HER FIRST!