What does beat boxing mean?

Answer 1

. verb; the attempt made by one to vocally replicate the sounds that would normally eminate from a drum set, drum machine or drum loop through a series of noises or popping sounds made with the mouth. 'beatboxing' is used throughout the hip-hop scene, and talented 'beatboxers' can be found in several urban settings.

Answer 2

The term "beat box" was originally used to refer to boomboxes of the 60's and 70's. Today it means to make noises with your mouth in a rhythmical manner.