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1.
verb: to be drinking alcohol
(see also "piss = beer" and "piss head = alcoholic")
He's really on the piss tonight!
by breivegan August 13, 2003
 
2.
1.Out with the boys/girls drinking lots of grog.

2.Built slightly out of whack, skewif, out of sync, not straight.
"You smell like you've been on the piss all night"

Boss- "That wall is on the piss, fix it"

Carpenter- "You need to speak to Johnny, he fucking built it"
by B3NN0 May 19, 2007
 
3.
when something is not straight, level or aligned properly.

usually as a result of lazyness, poor workmanship or being under the influence.
"gee Michelle, Angelo's parking is really on the piss today"
by zed z June 18, 2009