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When your bestie is too trashy, criminal, crazy, and lesbian-like to be a godmother, so you give them the title of Earth Mother just to shut them up and make them feel special.
"You’re not a godmother, you’re Earth Mother, and you’re the worst."
My friend got Earth Mother because she stole my lunch money and tried to seduce my dog.
She’s Earth Mother now, and I’m still mad about the sandwich incident.