An individual who attains orgasmic delight in the consumption of Pie. One who is well versed in the pleasure derived from the creation and consumption of Pies.
Did you see the speed at which that pie disappeared down his throat. he must be Piesexual!
To be pisexuial you must be 3.1415926% gay, and straight the rest of the way. This is seen most of the time during young adulthood, when men / boys mess around with each other (in a very slight sexual manner) but still lean twards being straight.