Lila's New Expletive

Lila has a new phrase that she yells when she's frustrated with someone. It's pretty bad because of the content and the anger behind it, but it's also really funny because of the misuse of the language.
Picture this: We're in the car and Emma is playing with something that Lila wants.
"Let me have it please, Emma!"
"Just a minute, Lila."
"PLEASE, let me have it!!"
"When I'm done, Lila."
"Emma - Don't be a DARN IT, Emma!!!"
Mommy (while laughing to self) says, "Lila, that's not nice. Say you're sorry."