your knee

Best definition
your knee
The final and ultimate insult in a string of insults consisting of your mom, your face, and your mom’s face.
Pirate: You’re dumb.

Ninja: Your MOM is dumb.

Pirate: Your FACE is dumb.

Ninja: Your MOM’S FACE is dumb.

Pirate: Your KNEE is dumb!

Ninja: …! *cries like a featherweight crybaby*