Green’s Dictionary of Slang

(US) an order of corned beef and beans.

1887		‘Dict. of Diningroom Sl.’ in Brooklyn Daily Eagle 3 July 13: ‘Beef and’ means beef and beans.
1888		N.Y. Herald 1 Apr. 9/6: ‘Beef an’’ meant corned beef and beans.
1906		S. Ford Shorty McCabe 10: How does it [i.e. a patent medicine] go as a substitute for beef and?