An adjective meaning fucking awesome.
It comes from class A drugs, in other words the best drugs.
Have you seen How High?
- Yeah, dude! That's a class A movie!
by Zachiister June 24, 2011
the top of the line insult. As in your the Class A of all bastards or any other insult you wanna call him/her. You can put Class A in front of almost any insult
Your a real Class A Dickhead Your a real Class A Bastard
by Mark Wilson Jr February 17, 2009
Electrical term, Class A Amplifier.

A class A amplifier is, simply put, one amp pushing a speaker in an out. The best way to describe it is to relate it to Class A/B. Class A/B amplifiers have 2 amps, one to push the speaker out (+), the other to pull it in (-). In guitar amps that use tubes, this means that one tube, a driver tube inverts the signal polarity before it reaches the B side.

A class A amp pushes and pulls the speaker, and thus must do more work. Most commercial (in home) amps (stereo receivers, etc.) are class A amps. Class A/B is generally used in guitar amps over 30 watts, high powered Bass amps, and professional power amps. Class A/B generally delivers the same power at double the impedance. So if an amp gets 100w per side @ 4 ohms, then it will generally get 200w bridged mono @ 8 ohms. This is rarely 100% true in practice.

Class A/B is also called "Bridging" an amp (transistor amps generally).
"The Vox AC30 is a simple Class A circut, and it runs hot! The classic Beatles sound indeed."
by Contraceptive SpongeBob November 30, 2005

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