An acronym for the phrase 'pwn you all!'
It is frequently used as a suffix to an object to show that it pwns.
A common variation of this word is pta (pwn them all)
1. Person A: I hate Dolphin's!
Person B: Are you kidding? Dolphinpya!
2. Person A: Homer is my favourite 'Simpson'.
Person B: No way, Bart pta!