Top definition
The act of going to the toilet when you don't really need to, to make sure you don't need to go later. Usually conducted prior to long car journeys or departure from drinking establishments.
Her:"lets leave this pub before your too drunk to leave"

Him:"OK, but I need to take an insurance piss first"
by SuperBeerFiend May 07, 2009
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2
Previous to the act of masturbation, an Insurance Piss is the act of urinating immediately after the primary finish. This is to ensure that the individual can avoid cleaning up his Second Wind. (See Second Wind).
Paul was tired of cleaning up his Second Wind, so he began trying an Insurance Piss. This way he could pee and not worry about a secondary clean up.
by The Crawling King Snake March 06, 2014
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The vengeful act of crapping on a lover's chest while they sleep.

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