Green’s Dictionary of Slang

(Irish) drunk.

1982		E. Mac Thomáis Janey Mack, Me Shirt is Black 155: The packing and the pints went on until the twenty-four eggs were all in the box and the man was langers.
1994		F. Mac Anna Ship Inspector 42: He said he had seen our dad staggering out of the Tall Ships, langered out of his mind.
2001		G. Coughlan Everyday Eng. and Sl. 🌐 Langers (a): drunk.
2001		OnLine Dict. of Playground Sl. 🌐 langered adj. very drunk.
2007		J. Meredith Learning to Float 151: Sometimes the boys were so langered they left unopened tins of Kestrel or Harp behind them as they staggered off home.