(noun) Explosive material that looks and feels like white clay. Most often used by military personnel, terrorists and modern-day bank robbers! C-4 can also be called "Composition 4" since it includes three other types of explosives along with the original base catalyst. Form of plastique.
Terrorists rigged the Khobar Towers in Saudi Arabia with C-4 before demolishing it.
by Smkngmgc December 27, 2004