To drink huge amounts of
beer or lager simply to get very, very
drunk. Not to savor the taste or flavor, but just to get wasted. The phrase is used in London and parts of England, usually associated with wide-boy or East-end types, although a
trip to Ibiza might be rewarded with a few examples too.
"C'mon
boys! Let's get lagered-up! Look at the locals, they're waiting for us to get proper
pissed! C'mon
boys! Lagered-up! Lagered-up! Waaay!"