Wiktionary
n. (context nonstandard English) A champion.
Wikipedia
Champeen was a 1983 musical by Melvin Van Peebles. It looked at the careers of Bessie Smith and Joe Louis, and had a cast of 18. It won 7 awards at the 11th Audelco Recognition Awards for Black theater, including best actress, best choreography, and best director. Although it covered Bessie Smith's life, it was not a biographical play. The New York Times reviewed it positively, although it was stated that Miss Reaves-Phillips was not given enough singing time.
Usage examples of "champeen".
But,” I added, swelling out my chest seven or eight inches, “I don't reckon I'll have to lick no more saps for sayin’ that Ritchie's Terror is the champeen of all fightin’ dogs in the Asiatics.
Don't be techy—but don't forgit that yore pap was once the rough-and-tumble champeen of Gonzales County, Texas.