the act of looking like a ratchet, messy, just plain gross. For example when someone gets drunk and starts acting trashy, or in many cases where a girl never cleans herself up and is always looking nasty
Oh my gosh, why does she come to school looking so rabby?
A douchebag who cheats on his woman and falls in love with their best friends. Also may be a person who takes his mother's clothes off in the middle of the night and beats off on her all night long.
Also likes cat porn.
OMG That look at that Rabby.