verb: to be drinking alcohol
(see also "piss = beer" and "piss head = alcoholic")
He's really on the piss tonight!
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"
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"