Green’s Dictionary of Slang

(US black) thoroughly, completely.

1935		E. Pound letter 18 Mar. in Paige (1971) 271: I am bone ignorant of the subject, but have vague feeling that something or other, etc.
1977		(con. 1969) M. Herr Dispatches 9: Even bone-dumb grunts seemed to feel that something weird and extra was happening to them.
1980		L. Mantell Murder and Chips 129: He was bone tired.
2006		G. Iles Turning Angel 204: He actually used the term ‘bone-dumb bluegums’ in front of me once.