To make a teasing, sarcastic, or insulting remark, gibe, or criticism at someone's or something's expense. I'm really not trying to have a jab at you. I'm just trying to give you some constructive feedback. He's really nice to me when we hang out by ourselves, but he always starts having jabs at me when we're around his other friends. I can speak the language very well, but they still can't resist having a jab at my accent.