People write this word to describe the sound that "Blood gang members" use to call out to let other members they are in the area; but the sound is supposed to be more like the "wooping" sound made by hyenas. This is used to call to one another similar to a hyena pack.
"Wooooop" "Wooooop"! "What up, dog? That's how you call your homies! Not su-wu!"
by RapFTB July 12, 2013