To eat muffin. Colloquial term referring to one who likes to eat another persons muff or 'muffin'. Generally in reference to a lesbian or female on female fellatio.
Lynette used to say that she 'never eats muffins' referring to the fact that not only does she not eat bready breakfast treats but also never partakes in 'muffin eating' and is not a 'muffin eater' of the female variety.
by Jon A Wordsmith December 15, 2010