Champion Jack Dupree (wiki discography bio MySpace AMG) was a New Orleans-born boogie-woogie blues piano player, who at various times in his life was also a painter, a cook, a POW, and a very good boxer. (For more about boxing and Stag, see here.)
This is a N'awlins-sounding poppy blues take on Stag, recorded the same year as Lloyd Price's huge hit, but not sharing much in common with that. This is from Dupree's biggest hit album, Blues From The Gutter, which also includes recordings of "Junker's Blues" and "Frankie and Johnnie."
Dupree namechecks Louis Armstrong in this song, and in fact the two of them were raised in the same orphanage home (Armstrong had family to live with, but was sent to the home several times for delinquency). Another lyric to note is that the gambling is glossed over in one line, but Billy begs Stag for a two whole verses. (Not quite as sadistic as Broke Toe Rezo's version, but still...)