Green’s Dictionary of Slang

plegic adj.

[SE paraplegic, on pattern of paralytic adj. (1)]

extremely drunk.

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[UK]J. Meades Empty Wigs (t/s) 425: Cressida from The Alibi who never had time to have hangovers because she was always plegic [ibid.] 438: How can you forget something like that? Easily, if you’re plegic. She drank for oblivion, for memory loss.