oh she is THAT bitch!

That certain someone who is so manipulative, conniving, negative, and untrustworthy that you are still surprised by her ability to be THAT bitch!

Lilly: "Did you hear about Cassandra yesterday? With Nate and then with his girl? Wow! I mean WOW!"
Kenzie: "You are surprised?! Girl, oh she is THAT bitch! Stay away. I do."
Lilly: "But she's my Mom..."