Alleyn's School Slang. Originated in a dissing battle between Nate G (touch him you die) and Alfstaz (stazzy b). It is used in attempts to irritate, anger or hit back at comments made by the other person in a dissin battle. Nate, losing the dissing battle, resorted to saying "Fuck you!" in a high pitched tone, thus somehow turning into "Pa You!" through many repetitions of the story. "fuck your mama" was also another diss utilised by Nate, thus creating "Pa your Mama"!
Mathasy: Hey nate, your dad is a codfish!
Nate: Pa you!