Definition of slappers:
(n) :
(countable) One who, or that which, slaps.
(n) :
(countable, UK, Ireland, Commonwealth, slang) A prostitute.
(n) :
(countable, UK, Ireland, Commonwealth, slang) A woman of loose morals.
(n) :
(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.
(n) :
(countable, slang, archaic) Anything monstrous; a whopper.