Bad-tameez is made up of bad-, or rather, bud- and tameez. Bud is Urdu for bad, and tameez is manners. And hence, badtameez, in Urdu, is a person who is ill-mannered, someone who is discourteous, uncivil, and in some cases, even vulgar.
However, bad manners in Urdu would be badtameezi, or bad-tameezee.
For the complete translated lyrics of Badtameez Dil from Yeh Jawaani Hai Deewani, CLICK HERE.