I dont think its lingo, it looks like hes just wasnt looking at the screen when he was typing.

I can sort of understand why gravano ratted. I mean he risked allot by going along with gotti and killing the boss also the fact that he was making millions for them and doing hits. To have gotti talking shit about how your making too much money and also pinning murders on him basically gonna make you wonder what was the point in any of it. Also if gotti was badmouthing him behind his back it probably wasnt too long before he would have ended up dead himself. Guys like gravano and massino would rather destroy what they helped build than allow it to go on without them.