Spar-GER; the cheap, bitter, drain-cleaning-fluid-like substance contained within generic white cans and sold as lager at your local Spar. Essentially, it is carbonated tramp piss.
"I've only got £2 to get collins
'ed on. Looks like I'd better buy a 12 pack of Sparger"
"He said it was Corona, but it literally took the skin from the inside of my mouth. I'm sure it was Sparger"