Green’s Dictionary of Slang

(US) an idiot.

[1816		J.H. Lewis Lectures on Art of Writing (1840) 84: Steal from other’s works to show His own goose-head doth something know].
1833		S. Smith Major Downing (1834) 95: Going? says he; why to bring ’em to the polls, you goose-head.
1883		Newcastle Courant 21 Jan. 2/4: Percy Goosehead — ‘I don’t want to marry a bluestocking — some girl that know more than I’.
1885		Puck (N.Y.) 1 July 275: If you should say Nantucket / You’re told you are a goose-head [HDAS].
1902		‘Hugh McHugh’ Back to the Woods 94: Th’ ould goosehead.
1905		Chelmsford Chron. 10 Mar. 8/5: When you call a member ‘goose-head’ you go too far.