It is an act of stealing petty goods from a gullible owner to sell it in pawn shops. The term is first used in a tamil movie, rendu (2006) when Vadivelu and Maddy steals from the Auto driver.
Madhavan: Hey, the project expenses are too much. How are we gonna afford it?
Vadivelu: "Paper-Liquid"
Maddy: you don't even have a job, how are you managing your finances?
Vadivelu: I have paper-liquided lot of things from my friend