1.)The act of ridiculing somebody, or otherwise attacking their character all the while knowing that they are actually right and telling the truth, and you yourself are the liar and the cheat. ie. Publicly admonishing, engaging in the defamation of their character, slandering, or libel. May go so far as to bring forth legal action upon someone for actually having told the truth about you, and thus exposing you.
Yo, even though that bitch really was cheating on Joe, she went around "Armstronging" him by saying that he not only cheated on her, but beat her as well!