Much like the "Sham-Wow", the sham-wack catches ejaculant from a male's penis. A halarious invention from Dr. Drew Pinsky and "Psycho" Mike Catherwood from the popular radio show Love line.
Ew man! what's that nasty orange rag doing on your bed?
"Naw man, It's cool! Thats just my Sham-Wack.