Green’s Dictionary of Slang

pointy-head n.

[both senses are derog. and suggest that an excess or an absence of brain lead to a ‘pointed’ head]

1. [1960s+] (US) a fool.

2. [1990s] (Aus.) by stereotype of sense 1, a peasant.

3. [1970s+] an intellectual; the implication is that they have no practical abilities [the locus classicus occurred in a speech by the far-right Alabama governor George Wallace in 1972].