The act of hitting a person in the following manner:
Start with a backhand, but after the hit, the hand stays pressed against the face. The other hand (of the person doing the slapping) then forms a fist and punches the open palm of their first hand (which is still on the face of the person being slapped); thus giving transference of the second hit through the first hand and into the head of the slapee.
For when a bitchslap just wont do.
"After pulling the kind of crap Travis just did, he deserved so much more than a standard bitchslap - indeed, he needed to be hound-slapped."