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The act of forcefully uniting areas capable of sexual activity that coincidentally are used for urinary purposes.
Example 1: Adam, Jenna, Lauren, Genna and Lynne all smashed pissers after the bar on Saturday night

Example 2: Lynne, Jenna and Lauren are headed to Cape Breton to smash pissers.

Example 3: Adam was smashing pissers with a female friend in Mulgrave when his mother walked in.
by Lauren'o'porno January 07, 2012