It's the kind of slap to give when someone you know well says something so stupid or rude or mean you have the sudden urge to reach out and slap them to reality. Sometimes it involves mulitple slaps for the real sublime statements.

Slappin yo bitch up

to slap a female to keep her in order
to make it truly effective, excersise this frequently to keep it strong

To perform it: lean back and thrust your body forward, cock your wrist toward the cheek of the undisciplined ho

the art of placing baby powder in your hand in order to slap someone

1. (noun)
An action that consists of the slapping of a person for unknown or unfair reasons; Like how a pimp would do his hoe

See also: backhand and bitch slap

what you do to someone who is being dumb

Bustin out the bernie mac on a beatchs azz