Green’s Dictionary of Slang

hopalong n.

[pun on SE hop along / the fictional cowboy hero Hopalong Cassidy created in 1904 by the author Clarence E. Mulford]

(US) one who walks with a limp.

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[US]E. Hoagland Cat Man 78: There was a boy David’s age who limped from polio or the war or something. Hopalong was what they called him.