Green’s Dictionary of Slang

1. (US) a second-rate boxer.

1907		L.A. Herald 20 Dec. 7/2: Tuesday night [...] the pork and beaners are to perform [...] at the big pavilion devoted to fistic development.
1910		G. Herriman in L.A. Examiner 1 June [synd. cartoon] Medicocrities, otherwise known as pork and beaners, lending voice in a small way to the galotious spectacle [i.e. a championshipm fight].
1912		Day Book (Chicago) 8 May 14/1: Yess, and vot wass he. Just a pork-und-beaner. He did nod earn der chamiponship [sic].
1915		Van Loan ‘Sporting Doctor’ in Taking the Count 28: Take the easy way, and go on being licked by every pork-and-beaner in the country. [...] Johansen is only a pork-and-beaner.
1928		T. Thursday ‘Sock of Ages’ in Fight Stories Oct. 🌐 If you don’t lick that pork-and-beaner, I’ll wallop you when you git home!
1931		J. Wilstach Under Cover Man 93: You look like a preliminary pork-and-beaner after a bad night.
1949		A. Hollandersky Life Story 24: Two dollars had been the top at the New York clubs where I had appeared as a pork-and-beaner.
1956		C. Lange Other Horizon 51: I’ll match my skill as a wrastler agin any pork-and-beaner pug like that guy.

2. (US) a cowboy, or in ext. use, a country-dweller.

1925

D. Hammett ‘Corkscrew’ Story Omnibus (1966) 217: Hold these, Milk River, while I take this pork-and-beaner for a romp.