The dry kick is a key element in kick rolls, a method that allows you to do multiple kick drums very quickly. It can also be a nice alternative to the classic kick.

To make the sound

1 - Make a "d" sound, like "duh"
2 - Take away the "uh" and add a little more pressure to increase the volume
3 - You can make it hollow by opening the back of your throat to get a bongo-esque sound

This is a very quiet sound, but with practice you'll be able to do it a little louder.

Peace, love, and half a roll

-FT