jackleg Share definition Flag Adjective, noun: The polar opposite of offdahook. A person or thing of low quality. A very unprofessional individual. MojoMan, after sniffing some bunk weed: "Man, what the fuck is this jackleg shit?" jackleg by stashgordon May 11, 2003 0 0 Get merch Get the jackleg mug. Buy Now — $32.95 See more merch