Green’s Dictionary of Slang

1. (US) a promiscuous woman.

1997–2000

College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Tool (noun) [...] 5. Slut, hoe, sleazy gal.

2. (US) (orig. campus) a despicable person.

1997		Eble Campus Sl. Fall 9: tool – a person of extremely bad nature or character.
2000		Eble Campus Sl. Apr.
2013		F. Bill Donnybrook [ebook] ‘Don’t pay Ned no mind. He’s a backstabbing tool’.