long-john Share definition Flag Long-john \lawng-jon\, verb: to repetively irritate; to bother incessantly; to drive crazy. "stop long-johning me, get that thing out of my face already" long-john by mE$c@Li+O~ March 12, 2009 0 0 Get merch Get the long-john mug. Buy Now — $32.95 See more merch