bitch·slap 
(bĭchslăp′) Vulgar Slang
(bĭchslăp′) Vulgar Slang n.
The act of slapping someone who is weaker or less powerful, as the slapping of a woman prostitute by a pimp.
tr.v. bitch·slapped, bitch·slap·ping, bitch·slaps
To slap (someone who is weaker or less powerful).