n. an individual's (male or female) non-biological lesbian step-mother.
"Portia de Rossi is my biological mother and Ellen Degeneres is my Muff Daddy" said Lady Gaga.
by retortme May 05, 2010
What former Monty Python member Eric Idle will call himself if he ever decides to become a rapper.
Eric Idle decided on Muff Daddy during his visit to Jon Stewart on the Daily Show.
by Jet April 09, 2005

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