My work can make the J's do the jumpman dance, can't it?
“Work” is slang for dope or drugs. “J’s” is short for “junkies” which means drug addicts. When he refers to the Jumpman he’s referring to the “Crank Dat Jumpman” dance that was an offshoot to the Soulja Boy/Superman, etc “Crank Dat” dances. He’s saying that his dope is so good it makes junkies dance when they try it.
“J’s” also is slang for Air Jordan sneakers and “Jumpmans” are a type of Jordan branded sneaker. Here he makes a clever play on words using the sneaker references and the drug and dance references at the same time.
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