couldn't organize a piss-up in a brewery

rude slang Is unable to arrange things successfully. (A "piss-up" is a social gathering at which people drink an excessive amount of alcohol—something that would be easy to do in a brewery.) Primarily heard in UK, Australia. No wonder Marie's event was a disaster—she couldn't organize a piss-up in a brewery! The leaders of this country couldn't organize a piss-up in a brewery, let alone overhaul the entire tax code! No wonder the strike failed. Those dipsticks couldn't organize a piss-up in a brewery!

couldn't organize a piss-up in a brewery

BRITISH, INFORMAL, VERY RUDE

If you say that someone couldn't organize a piss-up in a brewery, you mean that they are extremely bad at organizing things. She was fired after saying her boss couldn't organize a piss-up in a brewery. Note: A piss-up is a slang word for an occasion at which a lot of alcohol is drunk.