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Right when you finish taking a huge shit, and you believe that no more shit could possibly come out of your ass, you stand up to either pull your pants up (or wipe if you stand to wipe), and you have to sit right back down again because another piece of shit just showed up.
"Dude you were in there for like 30 minutes!"

"Yeah I know, I had 3 secondary shits"
by Dick Bakerr November 12, 2009