Racetrack underwear are boxers or tighty whiteys that have many skid marks and burn outs on them. Skid marks being shit stains that are shaped like a car track due to the action of the butt crack gouging the stain into the unerware. Burnouts refer to the holes in underware that the cause of remains a mystery to this very day.
My wife wouldn't sleep with me last night because she was tired of having to deal with my racetrack underwear all the time. I told her if she would stop buying the sams club brand tp then maybe it would not be so severe but she doesn't listen.
by saharadryhumor January 9, 2015
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