free-muffin 

When a girl "goes commando." Opposite of a guy who's "free-ballin"

From Family Guy: Ugh, look at Miss Tammy. What a skank. She's free-muffin it at a baby school.

free-muffin by mysuppletweets November 13, 2015

free muffin it 

The act of a woman not wearing underwear. (female version of freeballing)

"all of my underwear are dirty so I'm free muffin it"

"Wow! This is the third night this week that lindsay lohan has been snapped by photographers while she was free muffin it"

free muffin it by kickgirl91 May 15, 2013

free muffing 

When a woman goes without underwear - the female equivalent of free balling. Also called free buffing or going commando.

Half way through dinner, Jennifer told me she was free muffing and I couldn't get my mind back off of tagging her for the rest of the meal.

free muffing by Gettn N Eiffel February 8, 2008

Freebuffing 

not wearing underwear, usually applied to women

Freebuffing by Anonymous May 15, 2003