Beat juggling has its roots in cutting, in which a small section of a beat is looped using two copies of the same record. This was first done by Dj of late 60's and early 70's. Beat juggling become popular because of Kool DJ Herc, and later it was refined by other Dj's such as Grandmaster Flash in the early 80s. Two other fundamentals of modern beat juggling technique include "tapping", or "walking," where the DJ taps the record in between percussion sounds, stopping it momentarily to slow down the beat, or pushing it faster to speed it up, and "shuffling" or "strobing," where the DJ loops the two records at different points in the beat, literally remixing the record live by playing new combinations of the sounds on the records.
The term is an invention of the media, and not the actual title given by the creators. Juggling the beat merely describes what is being done. The inventor of the technique, DJ Steve Dee from Harlem, NYC, referred to it simply as bringing "The Funk" out of a record. He effectively made his own beats from reconstructing different parts of songs. The technique was refined by the DJ group The X-Men who later became The X-Ecutioners.