Top Definition
Taking more than enough pairs of underwear on a trip due to a severe case of the shits. The occasion is too good to miss so resorting to more undies is the only way forward, it's either this or you use a shart tampon.
Dave: What's with the big bag? We are only going to watch The Broncos play The Chargers.

Rob: Need Backup Undies

Dave: Got the shits?

Rob: Yeah
by Sieffy April 05, 2013
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