A portmanteau that describes a combination of a well known brand of mouthwash, and fresh urine. Often used as a form of revenge or prank.
"I pissed in his mouthwash. That's right, I mixed him up some Pissterine." -- Banana Tophat.
by Ratznium December 10, 2009
Restraining a person and peeing directly into their open mouth.
We gave John a pissterine rinse for his bachelor party.
by Rustyshackels June 12, 2010