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