Green’s Dictionary of Slang

a male homosexual.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: botter (bot-ah) n. He who botts.
1999		Roger’s Profanisaurus 3 (in Viz 98 Oct.) 5: bottee n. One who is botted by a botter.
2001		OnLine Dict. of Playground Sl. 🌐 botter n. Homosexual A term used to describe homosexuals or homosexual intercourse. eg: – ‘He’s a fucking Botter’.
2005		Roger’s Profanisaurus in Viz Apr. 49: Yorkie bar n. A puddle jumper, botter or gaylord.