To fight in a maner that you don't injure the opponite. Such as when you box with no gloves but instead of making fist you have a open hand. This way you can have the same thrill and satifaction of fighting but no injury. This is often done with friends and with no anger but can turn into a real fight if someone gets poked in the eye.
Played normally by kids age 12-18, a slap box is the rectangular hemming on the very top of the back of one's shirt, where the tag is tied on on the other side. If you have one, someone will shout "slapbox!" at you, and hit your back where the box is.
A term used infrequently (in areas of Chicago usually by a male), who has initiated rough intercourse with someone he dislikes or even hates in some cases.
RG decided to Slap Box with JP before Wayne got a chance.