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1.
A power clap is either a "slow clap" or a single clap with cupped hands that makes the loudest possible clap.
I'm having trouble hearing you over the sound of how awesome my power clap was.
by mpchebe June 07, 2010
 
2.
When you hit one of your hands with the other at just the perfect speed and velocity to get that distinguished, full, and powerful clapping noise.

The way (or angle) in which the hands connect is often much more important to the successful execution of the powerclap than the speed at which you clap them.
Example: ...*POWERCLAP*...
by Powerclap January 07, 2010