Green’s Dictionary of Slang

goose-headed adj.

(US) foolish.

1869		(ref. to 16C) Pall Mall Gaz. 12 Oct. 10/1: Gervase Markam [...] speaks of ‘the goose-headed peasants, who, notwithstanding that they are altogether ignorant, grow rich at our costs and charges’.
1889		Blackbrin Standard 31 Aug. 8/1: He suffered under the most vile imputatioons, the goose-headed public never considered that [...] he could not possibly have kept his marvellous voice in tune.
1901		‘Hugh McHugh’ Down the Line 38: Buck is one of those goose-headed guys who [...] start to make a killing every time they see a pretty girl.