Juicy Ready To Die Notorious B.I.G.

time to get paid, blow up like the world trade

yo he also referencin they bombed that shit in 93
Biggie is saying that he is about to make money and get big (blow up in this context means become popular very quickly, not actually explode), like the World Trade Center towers in New York City that were a symbol of U.S. financial power
widelian is right. Biggy is employing both meanings. http://en.wikipedia.org/wiki/1993_World_Trade_Center_bombing
Play on words. Blow up as in immediate combustion with force and power, when coupled with getting paid ~ The manner in which his music will quickly amass him riches is akin to the manner in which the World Trade shattered when attacked. (pre-911)