Jackassish
When someone who know starts acting like a complete jackass, when normally they're not.
Person 1: "Did you see that chick last night?"
Person 2: "Yeah, wasn't she hot, too bad she's Rachel's cousin..."
Person 1: "Rachel's my girlfriend! What's wrong with Rachel?"
Person 2: ".... Nothing.."
Person 1: "Why you being so Jackassish?"
Person 2: "Yeah, wasn't she hot, too bad she's Rachel's cousin..."
Person 1: "Rachel's my girlfriend! What's wrong with Rachel?"
Person 2: ".... Nothing.."
Person 1: "Why you being so Jackassish?"