Top Definition
Your stepmother. Title usually given to a stepmother who is not popular with the stepchildren. Pairs nicely with the derogatory term for stepfather- stepballs.
"You're buying someone a birthday present from 7-eleven?"

"Yeah, it's for my stepmuff."

"Wow, I didn't know you cared that much for her."
by KarmaCorn July 10, 2009
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