Short for JWH-018, the main synthetic chemical in legal herbs such as K2, Spice, etc. Has similar, if not more intense, effects of THC. Banned in many states and countries. Known to cause brain tumors.
Derek: Hey I drove all the way to Florida and brought K2 with me.
Thomas: Does it contain J Dub?
Derek: Hell yeah!
Thomas: We're gonna get so f**ked up and get the tumor time!