Hip-Hop is about self-expression and self-appreciation. It speaks to those who have an open ear; it displays itself to those who have an open eye. Today Hip-Hop is a multi-cultural fusion of many different contributions made by several ethnic groups, which is why it is considered to be a universal art and culture. The elements of deejaying, emceeing, breakdancing and grafitti, all conclude to form an art that is "colorless" and enjoyed all across the world.

Description from http://clubs.yahoo.com/clubs/thehiphopkrib
Breakdancing (or "BBoying") is a form of hip hop dancing that originated in the 60s from the Bronx. It consists of top or up rock, footwork, spinning moves (power moves), and freezes.
Uncommissioned (and often illegal) paintings on urban surfaces in public view, such as subways, external walls of buildings, or boxcars.