Amarainth

I was in a club tonight, and someone in the club was using a hud (or something else) that would, right after I said something, post our name again and a sentence after it as if we were saying more (in green). Example: [18:22:13] Amarainth Resident: where is it coming from? [18:22:13] Amarainth Resident: F*** you motherf***ing bit**es, go to he**! (in green)(I replaced curse words with astricks to post here) I typed the first "where is it coming from?" and the second appeared right after, I did NOT type it. Does anyone know what this object was? Is there anyway to detect who is "Impersonating" me?