A reference to dealing ('flipping') cocaine of a very eminent quality, 'fishscale.' 'Flounder,' a flatfish native to the North Atlantic and areas of the east coast of North America and the Pacific Ocean, has been substituted here.
sipping a cough syrup (sy-z-rup) concoction, usually prescription cough medicine with promethazine and/or codeine mixed with sprite and/or now 'n' later candies for flavor, which is an epidemic problem in some low-income regions as it is a cheap high/buzz