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1.
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"
by Nicky the Bool December 22, 2008
 
2.
When you spew up your kebab after a night out drinking
Ah sick did you just see that guy rebab!
by XxXmeXbabyXxX October 21, 2010