1)Obviously, a reference to the Wu-Tang Clan, a hip hop group from Staten Island, comprised of the Rza, Gza, Ghostface Killah, Raekwon, Masta Killer, ODB (RIP), Method Man, Inspectah Deck, and U-God.
2)Also, where I'm from, a blunt laced with coke (NOT crack). Gives a speedy high.
Example: 1)Wu was the shit in the middle to late 90's.
wu, aka wu banger, is a blunt wit crack rocks in it, a dieablo is a blunt wit coke in it, "But it was just a dream for the teen, who was a fiend, Started smokin wu's at sixteen
And running up in gates, and doing hits for high stakes
Making my way on fire escapes
No question I would speed, for cracks and weed
The combination made my eyes bleed" raekwon from the wu tang clan "cream"
Example: bill wu is really smart. not to be stereotypical of asians, since im sure bill is just naturally inclined to be a genius, and it has nothing to do with his asian heritage.