A gang of boys under the Brooklyn Bridge are united by their common interest in break dancing. Some work as pizza delivery boys, hence they call themselves the "Delivery Boys". They form a dance team and enter a local break dance contest, sponsored by a woman's panty manufacturer. A rival gang's sponsor intimidates their employer into thinking she must keep the boys working so they won't be harmed. She gives the boys some "specialized" deliveries to make them late for the contest. The antics and calamities abound as the boys wrestle with her work assignments and getting to the contest on time.
Don't have time to verify, but this might be a Scorsese flick. In the eighties he was doing New York Stories and music videos with a lot of dancing, right?
Update: Vid by request.