The words 'Break Boy and Break Girl' originated from the Bronx of New York. In the early 70's Dj Kool Herc would play the 'breaks' of songs. Meaning, he would only play parts of the songs where it was beat only, no lyrics. This would excite the people to dance. So in turn girls and guys who danced to these 'breaks' were called 'Break Boy and Break Girl' or 'B-Boy; B-Girl' in short.
B-boying started with the James Brown's 1969 "Get on the Good Foot". When on stage James Brown would dance around with such energy and almost acrobatic moves, many people began mimicking his moves, so they called it the "Good Foot". The 'Good Foot' was mainly dancing around that involved drops or spins on the floor. Thus, the beginning evolution of breaking.
During the 1970's martial arts were also very popular, so B-Boys (for the most part) incorporated martial art stunts to 'wow' the crowds. And today b-boying has evolved into a highly demanding dance physically and mentally. With massive b-boy dance competitions being held around the world, such as BOTY (Battle of the Year) in Germany and the FreeStyle Sessions.
A B-boy/break-boy (male) or B-girl/break-girl (female) is a term for a person who is devoted to hip-hop culture. The term "B-boy" has come to refer more specifically to a male who practices what the media refers to as breakdancing, i.e., an individual who has the ability to express his feelings through rhythmic dance combining a variety of dance forms with gymnastics and original body movements.
These stylized movements are commonly known as "breaking" or "breakdancing," and B-boys are often called breakdancers.