Green’s Dictionary of Slang

G-string n.

[SE G-string, the minimal ‘loin-cloth’ worn by striptease artists etc]

1. (US black) any device – a tampon, towel etc. – used to staunch the flow of menstrual blood.

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[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

2. (US gay) an athletic supporter, a jockstrap.

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[US]B. Rodgers Queens’ Vernacular 119: an athletic supporter [...] G-string.