Wiping again after taking a dump even though you wiped thoroughly the first time.

Wiping up a juicy fart.
"Man, I got some bowel problems cause I've post wiped three times already."

"Yo, dude I gotta post wipe before we go."
by J dizzle and the shnizzle December 2, 2007
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The act of wiping one or more times after flushing, so to assure of no leftover residue.
"Mister Nate used a post-flush-safety-wipe after using the work toilet."
by mister nate July 2, 2009
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