when a person spends all day in sweats or pyjamas and gets large amounts of stuff done, all without getting ready or dressed properly.

A combination of frumpy + Rumpelstiltskin.
"What are you up to today?"

"I got up early and I've just been Frumpelstiltskin all day, getting shit done at home. I didn't even brush my teeth."
by mischief the cat March 7, 2012
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