zabr is slang arabic in lebanese dialect for "dick" or "penis"
Usually it is used in a vulgar context. It is the more vulgar word of "penis=ayr" also in arabic.
my penis = zabri
zabri fik = literally means "my dick in you"
you're a zabr = you're a cock
la zabri = in context it means that it wouldn't make a difference
ex. la zabri if you like me or not