Shadowboxing is the act of jacking off, skeeting, spanking the monkey, beating off, or choking the chicken in your rack with the curtains are closed and when you have a light on in your rack. Then a shodow of you beatin your meat is dispalyed for everyone who happens to look and notice it to see.
Morrow-"Norton...quit jacking off while looking at porn at night. we could see the shadow of you beatin your meat. quit fuckin shadowboxing."
Norton-"Fuck...how the hell can you see through those curtains!"
Morrow-"Norton the shadowboxer."