Skid marks
The combination of white underwear with a person with minimal butt wiping skills, or, someone, like Tom, who wears the same pair of undies for 3 days.
Tom wears his undies for 3 days without washing. He doesn't wipe very well and leaves nasty skid marks for his wife to try and get out with bleach and Sunlight bar soap. He's a dirty man.
Skid marks by Maxwell Smartie June 27, 2009
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