A full-on drinking binge that runs way past the 'just one' stage, sometimes into the next day or two. You pop out for a cheeky pint and end up necking shots, buying a kebab at 6am, and messaging work absolute nonsense. Usually said as 'go on a bender'. Heads-up: bender is also an offensive slur for gay men, so don’t chuck it about.
"He said one pint after work. Three days later he’s still in Spoons, clutching a flat lager and a regret, swearing he’ll make Nan’s Sunday roast."