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
1 more definition
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