Commonly used in arabic countries, 'zakee fil mukh' directly translates to smart in the brain. But when your arab friend calls you this, he isn't complementing you. In reality this word means smart ass or brainless, just in a more comedic way instead of being to agressive.
"Ya ustaz, inseet kitabi"
"hey teacher, I forgot my book"
"Inta zakee fil mukh"
"You smartass"