ballhead, n. — Green’s Dictionary of Slang

ballhead n.

[SE ball-head, a head shaped like a ball; thus the person who has one. In Rastafarian use most whites, however hirsute, may be considered to be ballheads, in comparison with the Rastaman and his flowing dreadlocks]

1. (UK black) a bald person, thus ball-headed.

1957		‘Ed Lacy’ Lead With Your Left (1958) 75: The baldy driver asked, ‘Young to be a cop, aren’t you?’ [...] a couple of blocks later this billiard ball-head stops the bus to call over a beefy beat patrolman.
1957		‘Weldon Hill’ Onionhead (1958) 66: ‘One t’ing I can’t stand it’s a ball-headed college boy’.
2001		(con. 1981) A. Wheatle East of Acre Lane 232: He’s slowly goin’ a ball ’ead.

2. (N.Z./Maori) an outsider.

1989		Press (Christchurch) 14 Feb. 19: Ballhead: derogatory term used by one Maori to another, meaning ‘Pakeha.’ [DNZE].
1991		B. Payne Staunch 19: A bald’ead an outsider whom the Mob go to great lengths to be different from.