(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 28, 2005
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C-4 or Composition C-4 is a common variety of military plastic explosive. A major advantage of C-4 is that it can be molded into any desired shape.
"I fuck around and get hardcore. C-4 to your door, no beef no more, nigga."
by Leon S123. January 21, 2008
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A plastic explosive that blows the shit out of everything.
Stfu or I'll C-4 your ass.
by Adrenaline September 3, 2005
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The Ford C4 is a three-speed, light-duty automatic transmission introduced in the 1964 model year and produced through 1981

It featured an aluminum alloy 3 piece case (bellhousing, main case, and tailhousing). This was significantly lighter than earlier cast iron Cruise-O-Matic designs. It also used a Simpson planetary gearset.

It was used with Ford's inline six-cylinder engines and small V8 engines (see Ford Windsor engines), usually up to 302 cubic inches/5.0 liters. By comparison, the 351 Windsor and 351 Cleveland small- and intermediate-block engines were backed by the medium-duty FMX. A few C4s were built with a big-block bellhousing to use with Ford 335 engines, notably the 351M, but these are very rare.

It is especially notable as the original automatic transmission option in the Ford Mustang.

Modified C4s remain popular with hotrodders and drag racers due to their simplicity and durability.

The C-4 in my car sucks most of the torque and half the horsepower out of the engine before it ever gets to the wheels.
by junker March 22, 2006
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A female that sleeps with various males just to get popular. she has low self-esteem and is very ugly. she gives the best head but her sex game is horrible. you will find her in most urban sex tapes.She will most likely be easier to run atrain on and will sleep with you and your best friend the same day.
Super Head was the C-4 of the entertainment game. She slept with everybody and they brother.
by t-breezy March 29, 2006
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An intense rapper from Galt, CA...
by truthlesshero March 19, 2004
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(US LAW) tax-exempt nonprofit as defined under Treasury Code section 503(c)(4). Very similar to a 501(c)(3), but while a 501(c)(3) is more completely exempt from taxes, a 501(c)(4) has more leeway in what sorts of political activities it may engage in.

For example, a 501(c)(4) organization may explicitly endorse a ballot position or candidate, whereas a 501(c)(3) may not.
There are many examples of 501(c)(3) organizations paired with 501(c)(4) organizations. This arrangement is known as the "Sibling Option" and is used by the Koch Family Foundations for funding Tea Bag political associations.
by Sorry, the good guys lost September 10, 2010
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