Hexi-Kicks, also known as...
1. The Dead Sea kicks
2. The Grim Kicks
3. The Swift Six Swivel kicks (666 or SSS)
4. The Awesome Metal Louisiana Lightning Deadly Step of the Damned
In any case, HK's is the penultimate skill that a heavy metal drummer can aspire to learn. Simply put, HK's are 6, YES THAT IS CORRECT, SIX BASS DRUM KICKS PER SECOND.
This considered to be a form of godhood because so few metal drummers can achieve a perfect hexi-kick. Of all of the drummers out there only Dave Lombardo of Slayer and John Bonham of Led Zepplin have been able to master the Hexi-Kick. It is rumored that Bonham killed 666 unicorns with is hexi-kick, brought them back with necromantic Metal music, and taught them the technique to pass it on to the next generation of Metal. However everyone in the next generation was a pussy so they couldn't do it. Until Dave Lombardo appeared, he impaled each unicorn with his signature promark drum sticks, gained their respect and was taught the Hexi-kick. Dave has yet to find a successor to his throne of metal, so he hasn't seen fit to pass on the technique. According to Neil Peart, "Hexi-Kicks? Oh hell yeah I can do that one sec...", we never found out what happened next in the interview, because soon after the camera man and the interviewer's faces were melted and their heads exploaded at they beheld the Metal side of neil peart. "I DON'T WANT TO HURT PEOPLE! IM A GENTLEMAN! THAT'S WHY I DON'T PLAY METAL!"