You better not hurt her

A phrase used by lesbian teenage girls who are best friends with the girl you’re dating. They use this phrase to attempt to intimidate you, but it really doesn’t work and makes them seem stupid.

Mary: “She’s my best friend, so you better not hurt her!”
Bob: “What the hell are you going to do if I hurt her without getting somebody else involved? I’m almost six feet at the age of 14, lift weights at home, and have beaten up a bully of mine before. Tell me: how are you going to do anything?”
Mary: “Uhhhhh...”
Bob: “That’s what I thought.”