from the root "that's right" or more fully, "that's right, you are my possession"
meaning: hello, goodbye, fuck you, what the fuck, what the hell, see ya, i'm out, no way, that asshole, get out, that's right, you know it
person1: ehtha
person2: ehtha
person1: ehtha
person3: ehtha
persons 1&2: ehtha
person3: ehtha