Boom-Chicka-Boom

I says a-boom-chicka-boom!
I says a-boom-chicka-boom! (Group echoes)
I says a-boom-chicka-rocka-chicka-rocka-chicka-boom!(Group echoes)
Uh-huh! (Group echoes)
On Yeah! (Group echoes)
One more time! (Group echoes)
A little . . . . LOUDER! (Group echoes)

Each time a leader adds a different variation such as:
QUIETER, POSHER