Green’s Dictionary of Slang

nutmeg n.

[play on nut n.1 (1b)]

(Anglo-Ind.) the head.

[Ind]Civil & Milit. Gaz. (Lahore) 27 Sept. 1/4: And when it’s hot the punkah-wala always starts to snore / So you dot [? illeg.] on the nutmeg and he only grunts some more .