its shit that got hammed into your underwear.  occurs when u dont wipe your ass after a soupy shit, some gets stuck on your ass crack and this is called (magoo) this could harden into a poob(see poob), also, if somebody is trying to act funny by doing a fake fart, and that results in shitting in your pants and no funny farting sound, u have gained nothing  funny out u it, but only a nasty shitstain on your underwear that is embaressing to yourself and others when they see it, or find out about it...
he took a crap, but all his ass hairs prevented it from reaching the toilet and acted as a net, he also ran out of toilet paper, so he went to the store and he came home and later found a shitstain that got hammed on his underwear
by slapapig September 27, 2003
Get the ShitStainmug. An utterly objectionable and despised individual.. especially one whose personality is compounded by subnormal intelligence.
by SNELDAWG January 13, 2006
Get the shitstainmug. An utterly worthless and stupid person who adds nothing but anger and frustration into the lives of others.
Barack Hussein Obama is the world's worst shitstain.
by smartwater68 September 9, 2009
Get the shitstainmug. disgusting, loathesome, vile, distasteful, wrathful, belligerent, and more. shitstains are human fecal matter. They are the lowest of the low.
by agent of chaos November 6, 2008
Get the shitstainmug. 1)a stain of shit, usually found on clothes or the ground
2)A person that is a stain of shit in your mind
2)A person that is a stain of shit in your mind
1)His underpants are the one with the huge shitstain on them
2) Shut the fuck up you stupid shitstain
2) Shut the fuck up you stupid shitstain
by clow July 13, 2003
Get the ShitStainmug. A person who's complete and utterly disgusting, smells like cigarette smoke, is arrogent, thinks that if she bore you she can kill you, and drinks boxed wine.
I mean, who drinks BOXED wine?!
I mean, who drinks BOXED wine?!
Christina L. B.
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by Royal Rainbow!!!! April 1, 2005
Get the ShitStainmug. Alec Baldwin is such a shitstain!
by 7samurai December 9, 2002
Get the shitstainmug.