Green’s Dictionary of Slang

laugher n.

a one-sided sports contest; a rout; lit. something considered risible.

J.B. Holway Josh & Satch 79: Every one was a complete game, except for one 15—3 laugher.
[US]M. Ribowsky Don’t Look Back 55: Satch racked up two shutouts against Memphis, a 10-strikeout, 2-0 beauty [...] and a 10-0 laugher.