Chovilla comes from the name Pancho Villa. Pancho was a Mexican Revolutionary general dating as far back as the late 1800's to early 1920's. He was a train robber and a Violent man and also raided many places.
So with that being said, Pwnchovilla is when a kid gets pwned old school style. Pwnchovilla is when someone gets raided on or gets ganked.
"I'm gonna Pwnchovilla his bitch ass!"
"Damn, that kid Pwnchovilla'd us!"