'Jabangr' is an abbreviation of the question: 'did you bang her?' It is used as an immediate response to friends of yours who are talking about various girls/women they've met and/or been on dates with. It's not important whether or not you care about the person actually banging the girl.

Unlike the actual question--"did you bang her?"--which is intended to elicit an answer--the abbreviated phrase is used more as an interjection designed to introduce the thought that maybe you should have thought harder about trying to bang the girl.
Paul: "So I met this girl last night..."
Brett: "Jabangr."
Paul: "Ha, no we had dinner, but then afterwards one of her friends showed up, and..."
Brett: "Jabangr."
Paul: "Man, what a panoche you are."
by Barnacle Bill August 15, 2011
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