Green’s Dictionary of Slang

tooler n.2

[tool v. (1)/tool n.1 (1a)]
(US)

1. a male sexual performer.

[Aus]R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 73: Les fancied himself as a fair sort of tooler.

2. a male homosexual.

[US]‘Jennifer Blowdryer’ Modern English 74: homosexual men (n): Butt Boys, Turd Burglars, Toolers, Fudgepackers.