A fork of Rural Dictionary
The literal and/or metaphoric slapping or whacking someone in order to knock some sense into them.
Someone bitchslap the TV producer that keeps putting Vince Guaraldi's "Cast Your Fate to the Wind" on as background music for the weather reports on Hurricane Frances in Florida!
To slap someone (particularly but not necessarily female) who is being rude or nasty, perhaps screaming a lot (i.e., being a bitch). The idea is to get them to calm down and behave. It doesn't necessarily mean you really hit the person; there is such a thing as a verbal bitchslap.
Did you see how Rush Limbaugh stopped spewing that right-wing Nazi bullshit after Howard Zinn bitchslapped him on national television?