Someone who spontaneously eats like a pig.
Cheerleader 1: Did you see Jane eating yesterday?
Cheerleader 2: Yeah she so has pigeyetis.
Cheerleader 1: I Know its disgusting.
*Dude all of a sudden eats like crazy*
Dude 1: I totally got pigeyetis.
Dude 2: WOW that was amazing how did u eat all that!