The Collaborative International Dictionary of English v.0.48:
Squaw man \Squaw man\ A white man who has married an Indian squaw; sometimes, one who has gained tribal rights by such a marriage; -- often a term of contempt. [Western U. S.] [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
squaw man n 1: a white man married to a North American Indian woman