slapper

Etymology

slap + -er. For senses 2 and 3, the OED tentatively quotes the Bloomsbury Dictionary of Contemporary Slang: "This working class term from East London and Essex is probably a corruption of shlepper or schlepper, a word of Yiddish origin, one of whose meanings is a slovenly or immoral woman."

noun

1. (countable) One who, or that which, slaps.
2. (countable, UK, Ireland, slang) A prostitute.
   A fella looking dapper / And he's sittin' with a slapper / Then I see it's a pimp / And his crack whore 2006, Lily Allen, Iyiola Babalola, Darren Lewis, Tommy McCook (lyrics and music), “LDN”, in Alright, Still, performed by Lily Allen
   You've got a photo of the dead grandad, no pic of the blonde slapper? 2022, Liam McIlvanney, The Heretic, page 167
3. (countable, UK, Ireland, Australia, slang) A woman of loose morals.
4. (countable, military) A type of detonator which uses a powerful surge of electricity to vaporize a thin metal foil, propelling a larger piece of plastic film at a speed high enough to detonate an explosive upon impact.
5. (countable, slang, archaic) Anything monstrous; a whopper.