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A mark on the backside of underwear resulting from flatulence which excretes a small amount of fecal matter. Usually brown in color.

Also a derogatory name.
Example 1: You have a fartmark in your underwear.

Example 2: You're a fartmark.
by Explicit_Incog May 17, 2008
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when a male skeets in his drawers. This is usually used with a kid that shits his pants.
Mommy, I didn't poop my pants, its a fart mark.
by Dustyeyes January 02, 2009
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