The physical movement of putting someone in a corner and using at least 2 people to
box them up.
Then you proceed to hump and "rape" them in a hard manner while making them sing "Fefe" the Niki Minaj Part.
Usually this applies to the people who tend to be in locker rooms or in just any regular corner where a victim is capable of being boxed.
The word
Chad in the word
Chad box is just the name of the mascot who came up with the idea. however, he gets Chadboxed himself.