To have a situation under control and then for no reason at all mess it up badly. From the surname Munson, used in the movie Kingpin.

Johnny was winning the race by a mile, until he munsoned everything up and tripped on his shoelace.

Dictionary of american slang with examples. .

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  • Kingpin (film) — Infobox Film name =Kingpin caption =Theatrical release poster director = Bobby Farrelly Peter Farrelly producer = Brad Krevoy Steve Stabler Bradley Thomas writer = Barry Fanaro Mort Nathan starring = Woody Harrelson Randy Quaid Vanessa Angel Bill …   Wikipedia

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