She called him a dirty 'liar'.
(..) - Frank. I got no access to Queenan's undercover files. He and Dignam run the snitches. - I'm doing my... - You know what, I thought I was the liar. Hey, I can explain that! Costello recorded everything. He put all the tapes in a box and kept them with his lawyer. That was his insurance. (..)2006 The Departed
(..) I need access to those files. I forgot the password but if you come with me I'll give it to you. - That's a fucking lie. - Nobody calls me a liar! Shut up! Work with the tech guys to unlock those files. - Dignam, take a leave of absence. - Take a leave of what? Queenan is dead. I'm your boss now. (..)2006 The Departed