When a female neglects or chooses not to wear panties for any number of reasons
Girl, that skirt was so tight, I had to free clam just to avoid panty lines.
by humminbird July 01, 2010
A woman "going commando", or the female's version of "freeballing."
Oops, she did it again - apparently Britney decided to free clam that day and gave the photogs another free show.
by Kinaya November 11, 2008