A substitute for the phrase "the bomb", meaning very good and enjoyable. Usually in reference to an inanimate object rather than a person. Commonly pronounced without heavy articulation: "se'-fow"
'It was C4 up in there last night.' or 'Man that party was bustin' C4!'
by Mark Mc June 06, 2007
(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.
by Smkngmgc December 27, 2004