The substitution of trademarked product names with fake or phony product names in order to avoid the payment of licensing or advertising fees.
Product displacement is frequently used in the television and movie industries in the 21st Century as a means of representing a certain product without using the exact name to avoid any potential legal costs to the producers of the programs.
When you are buying drugs from a dealer, you want them to show you the weed, speed, ecstasy, cathinone, Adderall, Ritalin, or Modafinil first. If they don't show you the drugs and the dealer just asks for money first then they're scamming you because they will say "wait here" then disappear and don't have drugs. Product first!