When travelling in a vehicle for great distances, ie all day, you are forced to hold your bowels due to the lack of clean restrooms.
Jack(Passenger seat): Brad why are you all clenched up with sweats over there?

Brad(Driving): Because I've been driving for 600 miles and my Road Turd is crowning! I can't wait to get home to my bathroom.
by SpicyTuna23 August 20, 2011
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Not having the ability to poop for an extended period of time because of driving or riding in a vehicle.
Travis says: "Dave where are you going?"
Dave says: "I'm going to take a crap, i don't think i can road pack a turd for an hour!"
by travdizzle November 20, 2008
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