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The word women in the 1950’s used to describe bisexual women- because they “cut both ways”.

A clever and subtle way to describe someone who is bisexual.
Sarah: It’s obvious she’s into guys... but she was hardcore flirting with me last night.

Jess: Maybe she’s a Gillette Blade!
by Tired_and_angry June 25, 2018
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Gillette blade is a term used to describe bisexual women because a Gillette blade cuts both ways.
“I think Sally’s a Gillette blade... yesterday I saw her flirting with Margaret and Tommy.”
by Dariaismyspiritanimal June 11, 2018
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