slapper

1 8.8

A person who hits someone or something with an open hand

: abofeteador

My father kindly said (while my palm still itched): "It is nice of you to defend the honor of those who deserve it; but slapping someone is never honorable, for it humiliates both the slapper and the slapped."

Examples

Get back to your home, slapper!

Promises Written in Water (2010)
Yeah, yeah, that's the slap of someone who slapped people before.
The child playfully gave her brother a little slapper on the arm during their game.
He was taken aback when she gave him a surprised slapper after he teased her.
During the silly argument, she jokingly offered him a slapper to make her point.

spanker

vsslapper

1 9.3

A person who hits a child with an open hand to punish them

lacks the punishment purpose and can be done for other reasons

knee slapper

1 6.8

A very funny joke that makes people laugh loudly

thigh-slapper

1 8.1

A very funny story or joke that makes people laugh a lot

slapper singular

slappers plural

slapper = slap (transparent) = slap + er

Agentive '-er' added to the verb 'slap' produces a person who performs the action; this is a straightforward, predictable derivation.

Slapper comes from the verb slap ('to hit with an open hand') plus the agent -er ('one who'), so it simply means 'one who slaps'.