Green’s Dictionary of Slang

1. (US) the penis.

1953		Randolph & Wilson Down in the Holler 101: The word dinger means penis, too.
1992		(con. 1920–57) Randolph & Legman Ozark Folksongs and Folklore (1992) II 787: Other common names for the male organ are [...] dick, dinger, dink, [etc].
1996		Weekender (Wilkes-Barre, PA) 8 Feb. 41/2: All men have difficulty controlling their...dinger and even vegetarian males in controlling their ‘meat’.

2. (Aus.) a condom.

1985

‘Thommo’ Dict. Aus. Swearing & Sex Sayings 35: DINGER — Condom.

3. (UK Black/gang) a gun.

2016

67 ‘Milly Rock’ 🎵 Hammers and dingers galore.