another term for retard, normally used to describe someone acting stupid or silly, but can also be used to describe an actual retarded person.
"Don't be such a fuckin' rebab."
"Frank was shaking his head like some kinda fuckin' rebab"
"I felt bad for laughing at that bus full of rebabs"
When you spew up your kebab after a night out drinking
Ah sick did you just see that guy rebab!