You know that dangly bit at the back of your throat? Well, that's your uvular. Everyone who snores can oscillate this!
Standard Beatbox Notation (SBN)
{ GG }
Method
To make the uvular oscillation you must snore outwards!! You make a channel with the back of your tongue to direct the air over the uvular and the uvular flaps (oscillates) creating a fast 'kkkkkkkk' sound.
When this is combined with other sounds you can do everything from kick rolls to timestretched vocals to phones to helicopters to daleks!
Thanks