(countable) One who, or that which, slaps.

(countable, UK, Ireland, slang) A prostitute.

(countable, UK, Ireland, Australia, slang) A woman of loose morals.

(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.