If you kick somone in the head once and knock them out / un-concious, you have infact Kempo Kicked them.

To perform this skill effectively, one step back must be taken before stepping forward and kicking (once) hard to the head region.
Jack: "Dude, you just knocked him out with one kick!"
Dean: "Yeah, that was a Kempo Kick"
by WeeBino October 2, 2009