twat

Etymology

Unknown origin. Possibly cognate with Old Norse þveit (“cut, slit, forest clearing”), and if so a doublet of thwaite. May however simply be onomatopoeic or sound-symbolic.

noun

1. (vulgar, slang) The vagina or vulva.
2. (offensive, vulgar, slang, chiefly UK, Ireland, Australia, New Zealand) A contemptible and stupid person, idiot.
   At 4pm, the phone went. It was The Sun: 'We hear your daughter's been expelled for cheating at her school exams...' She'd made a remark to a friend at the end of the German exam and had been pulled up for talking. As they left the exam room, she muttered that the teacher was a 'twat'. He heard and flipped—a pretty stupid thing to do, knowing the kids were tired and tense after exams. Instead of dropping it, the teacher complained to the Head and Deb was carpeted. June 24 1992, Edwina Currie, Diary
   LARGE MOCHA TO GO, MEDIUM CHAI FOR HERE, YOU TWATS 2009, Jeph Jacques, Questionable Content (webcomic), Number 1433: Sweet Distraction

verb

1. (transitive, Britain, slang) To hit, slap.
   Arnold Rimmer: What are we gonna do? Dave Lister: Well, I say let's get out there and twat it! 1989, Red Dwarf, series III, episode 3 (Polymorph)
   "Umbridge'll twat him into next week." 2005, S. J. Smith, Joe Public
   "I'd love to twat her over the head with this. What d'ya reckon?" "She'd certainly bleed a lot." 2006, Martyn J. Pass, Dani Pass, Waiting for Red
   That's the only time I have been twatted by someone. 2007, Mark Button, Security Officers And Policing: Powers, Culture and Control in the Governance of Private Space