Green’s Dictionary of Slang

(US) a white man living with a native woman; also attrib.

1873		Wkly News Democrat (Emporia, KS) 4 Apr. 1/4: He was known up here as a ‘squaw-man,’ that is a fellow that made his home with an Injun squaw.
1880		Courier-Trib. (Seneca, KS) 30 July 7/1: ‘Squaw-man’ is the name given to a white man who has married one or more Indian wives.
1883		Aberdeen Jrnl 26 Dec. 12/3: The renegade retrograded to the status of ‘squawman’ [...] wherever an Indian tribe exists [...] to tolerate him and his brown spouse.
1891		Seattle Post-Intelligence (WA) 4 Jan. 9/1: On our frontiers [...] the white man, whether Spaniard, Mexican, Frenchman, English, American, who married an Indian woman was called a ‘squaw-man’.
1898		Cincinnati Enquirer (OH) 22 Oct. 10/7: That affair was also traced to a band of Sioux with the squawman leader.
1906		C. M’Govern ‘Soldier Sl.’ in Sarjint Larry an’ Frinds n.p.: squawman:—An American married to a native of the lower class, — or living with her without marriage.
1907		C. M’Govern By Bolo and Krag 37: [He was] the first ‘Philippines squawman’ I ever laid eyes on, a contemptible sight to every white man who saw him, and the butt of every native’s scorn, lower than the native woman with whom he lived.
1915		Leavenworth Times (KS) 14 Apr. 2/4: ‘That is true,’ laughingly replied the squawman, ’but remember that my wife and I are both in good health’.
1924		Press-Trib. (Roseville, CA) 31 Oct. 6/3: Sam Terry was a squawman [but] not the typical gambling, wife-beating derelict who becomes a a squawman of necessity or slothfulness hated by both the indian and the white man.
1936		K. Mackenzie Living Rough 71: An old German squaw-man who had been shacking up on a creek in Bristol Bay and living with a squaw for twelve years.
1952		Rocky Mountain Telegram (NC) 8 Aug. 12/3: The squawman seemed unperterbed. He continued to smoke his pipe.
1963		Springfield News-Leader (MO) 9 Nov. 5/5: The squawman issued orders and made threats.