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1.
Asserting that due to having run out of regular toilet paper, one has been reduced to ripping (the virtual) pages out of the Urban Dictionary to wipe one's behind with after defecating.

(An absurdist but wry way of deflecting an insult about one's hygiene, neither admitting the charge nor getting into an unnecessary fight.)
Outta cash, bro. Been urban wiping.
by Dr Whosis December 08, 2010