The story
From toe + tapper. The second sense (“a joke”) derives from the practice of tapping one’s toes to indicate pleasure; compare toe-tappingly. The third sense (“a closeted homosexual, especially one who solicits gay sex”) derives from the Larry Craig scandal in 2007 in which then-Senator Larry Craig was arrested after tapping his right foot in a men’s restroom, an action seen as covert solicitation of sex.
First known use, by meaning
- from 2007 A homosexual who is closeted regarding sexual orientation, especially one who solicits gay sex.
Etymology from Wiktionary, CC BY-SA 4.0.