Green’s Dictionary of Slang

gadget n.

also gidget

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

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

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

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