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when you have a diet high in greasy food, you leave behind residue in your underwear called shartmarks when you fart. your farts have liquid fuel that occasionally, accidentally end up with a bit too much substance behind them.
"too much take out has left Steven no choice to replace his boxers due to excessive shartmarks"
by stevenjchamplin December 26, 2012
4 0
1. Flecks of poop shrapnel left behind after pooping in a toilet.

2. Marks left behind in your underwear from sharting.
After your daily deucing, check under the seat to make sure you didn't leave any shart marks, especially if you're pooping at a friend's house.
by PooEtiquitteEnthusiast August 23, 2011
2 0