"he or she couldn't set up a piss in a brewery",means that someone is so useless that can't do anything properly,not even getting drunk (getting pissed) in a brewery.it's a scottish saying
"who is gonna book the restaurant ?" "billy says he'd take care of it" "oh,fuck, billy?he couldnt set up a piss in a brewery"
by giorgiorodin August 24, 2006
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