Pronounced like "Up Rock"
This is a beginning move of a breakdance that transitions from an opening stance to footwork. This could be anything from just bouncing up and down around a cipher or battle circle to a more fancy pop-lock. This hip-hop term originated sometime in the mid-late 1980's and is used to describe the opining move of b-boys and b-girls. The style of a breakdancer is identified by their unique combination of uprok, footwork, and freezepose.
The music label "Uprok Records" was named in reference to this term, and was started as a hip-hip division of BEC/Tooth and Nail. The label's original artists such as Mars Ill, Deepspace5, MG! the Visionary, and Tunnel Rats have all now left the pretty-much defunct label over disagreements with the promotion tactics of the parent company. The artists have noted that the hardcore execs didn't even knew what Uprok meant and didn't know anything about the hip-hop culture or scene.
Yo, that b-boy's uprok looked dope, but his footwork is wack. I could totally crush him in a cipher circle, because no one remembers the uprok, and my freezepoze is more slammin' than anything he could through out.