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1.
Two or more people who have established a ritual bond by urinating in the same toilet at the same time. There is no male form of the word, and therefore all people who perform this ritual are "Pissters" with each other, regardless of gender.
Hey, Todd - have you met my Pissters, Larry and Megan?
by Pissters April 11, 2010
 
2.
To make more pissed off.
stop that, you're getting me pisster.
by Jeffreev July 08, 2006