Bastardization of "For Sure." Absolutely, totally, I agree, 100%, etc.
Derivatives: Fushu central, Fushu city, Double-Fushu, etc.
"Yo I gotta get me the newest iPod."
"Fushu, man, Fushu."
Drunken upload of pictures, after a night of partying.
My wife came home from a night of heavy drinking and "druploaded" all the pictures from the evening.