jnco thug Share definition Flag A jnco thug is a person who is a lower class citizen and wears jnco jeans, sweatshirts, etc. This person would also be white and think that they are a hardcore gangsta. Uh oh, its the jnco thug. Better hold your pockets. jnco thug by ponylover April 5, 2005 0 0 Get merch Get the jnco thug mug. Buy Now — $32.95 See more merch