A kick roll is a very fast repetition of kick drums usually achieved by a real drummer by using two kick drum pedals. Of course on a drum machine or sequencer, you just tell it to do a heap of kick sounds in a row. So how do you do it with the mouth? Well, one way is to use an oscillation.
Standard Beatbox Notation (SBN)
{ BBDD }
Method
To learn this sound we need to learn to make a lip oscillation { BB } and a tongue oscillation { DD }.
For this method we then combine two oscillations:
{ BB } + { DD } = { BBDD }