Green’s Dictionary of Slang

bludgeon n.

the penis.

1890–1904		Farmer & Henley Sl. and Its Analogues.
1896		Farmer Vocabula Amatoria (1966) 48: brichouard, m. The penis; ‘the bludgeon’.
1997		Locker Room Tales (NJ) Aug. : 127His wiry cockhairs tickled our noses and lips as we packed his big bludgeon down our throats.