Green’s Dictionary of Slang

1. (US) to work as a street prostitute .

1967

in S. Harris Hellhole 91: So I worked as a call girl instead of on the street [...] and I made a lot more money than I did shitkicking. [Ibid.] 92: Now that I’m shitkicking for my money [...] where I end up is the House of D.

2. (US) to beat up, to kill; thus n. shitkicking, a severe beating [see kick the shit out of under shit, the phr.].

1981		Times (Nanaimo, B.C.) 8 Jan. 13/4: ‘If I start getting a shit-kicking, I’ not going to stay around’.
1993		J. Mowry Six Out Seven (1994) 108: Lactameon could believe that his gang had shit-kicked Sebatian, one way or another.
2023		(con. 1962) J. Ellroy Enchanters 86: She put out zero boo-hoo per her shit-kicked brother [ibid.] 404: He withstood a good shitkicking.