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1.
State of being, where you're so drunk that you piss yourself.
He was pissy drunk, even though he only had one beer to drink. Punk.
by Brandon December 01, 2003
 
2.
When you are so inebrieated your too lazy to go to the bathroom to piss, so you just piss in your pants.
Looks like Leon left a puddle in front of the loveseat. He was the last one I saw sitting there and I suspect he was pissydrunk.
by uncle soily July 11, 2010