In the book at the moment I've got at hand titled "The Oxford Dictionary of Slang" the idiom is labeled as "Mainly US", however after searching on the Internet I found this,

as drunk as a piss...

In this episode, you'll hear how two young boys are snatched in broad daylight from rural Missouri and held captive by a predator who had been patrolling the area for months.SHOW NOTES:Intro music by GabrielDouglas, backing loop by DreamHeaven and JuliusH.…

The Roman Legion XX, Valeria Victrix, played a key role in the conquest of Britain and in subduing the local tribes to Roman authority and culture.