What is the meaning of Slapper?

One who, or that which, slaps.

A prostitute.

A woman of loose morals.

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.

Anything monstrous; a whopper.

comparative degree of slap

present of slappe

Source: wiktionary.org