when a girl gets caught red handed being shady (lying, cheating, etc.) yet, in the face of overwhelming evidence, still denies everything making herself look even worse.
Jack: "did you hear about Jessica and Tim?"
Roy: "no, what happened?"
Jack: "she totally sammi-sweethearted him"
Roy: "oh yeah?"
Jack: "yeah man, he caught her sexting her ex-boyfriend but she still tried to deny any wrongdoing."
Roy: "haha, nice"