Used to to insult someone or express anger.
Can just be used as a meaningless expression (word) to yell.
Also can be used as a substitute for "rabies."
Origin similar to craisins (cranberries + raisins).
Steve: Why do I suck at this??
Donna: Because you have crabies.
Beth Ann: AHHHH I'M SO MAD... CRABIES!!!!
Random guy: I just saw a squirrel outside foaming at the mouth. I think it had crabies.