The reddish tinted residue from the menstrual cycle, most commonly observed in white underwear. A more serious instance would be if the girl's pants also exhibited stains.
by jhgfng1 May 7, 2010
Get the Period stainsmug. An insult used to describe someone who has just done something particularly stupid. It comes from the markings left behind in a womans underwear following some desrciption of vaginal discharge.
by Chris Wynne June 24, 2005
Get the twat stainmug. by Magic January 22, 2005
Get the skid stainmug. by John Stambaugh August 2, 2006
Get the yum stainsmug. by Nigz December 31, 2005
Get the white stainmug. by Jeff February 12, 2004
Get the poo stainmug. by clarky-05 April 9, 2005
Get the wank stainmug.