either in the context of being angry, or having left a place.
an event containing alcohol.
usually used to describe being rained on.
dawdle or delay; procrastinate.
attempting to prove one's abilities are better than someone else's, for no discernible gain.
Piss faced (see also 'shitfaced'):
either angry, or something very small.
weak or disappointing.
As an example:
George and some other piss head got into a pissing contest, where George put in a piss poor effort and got pissed off because it started pissing down. He'd figured it would be piss easy to win, so he was pissy and spent the rest of the afternoon pissing around before deciding to piss off and avoid getting pissed on any further by the rain.