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An acronym for: S-sudden I-immense R-rectal P-pressure. When you get a sudden urge to take a crap. You have an immense pressure in your rectum and you need to rush to the toilet.
Oh my gosh i have to go to the bathroom i have S.I.R.P

Wow that milk really gave me SIRP
by lilfarter143 August 29, 2013