Say it one more time....(in S. Jackson's voice)

who's pumping?
Elvis Costello, Danzel, Technotronic, The Black-Eyed Peas, Joe Budden, MC Hammer, Water Hog 5000, Golden Child (골든차일드), Mike Candys, Moksi, and even Bronisław Komorowski -
I shit you not(pun intended).
The better question is, who isn't pumping?
Not this cat.