Green’s Dictionary of Slang

1. (US) the penis; thus in pl., the male genitals.

1942		Berrey & Van den Bark Amer. Thes. Sl.
1966		Trimble 5000 Adult Sex Words and Phrases.
1978		L. Kramer Faggots 320: Ding-dong, dingus, dink, dork, flute, front porch, gadget.
1999		D. Lypchuk ‘A dirty little story’ in eye mag. 8 July 🌐 She admired his gadgets.

2. (US) a striptease artist’s G-string.

1938		H.M. Anderson Strip Tease 29: Paul, who sells the rhinestone ‘gadgets’ — otherwise G-strings.
2012		W. Keyser ‘Carny Lingo’ in http://goodmagic.com 🌐 Gadget — Girl-show slang for a ‘g-string’.