jag Share definition Flag to bullshit; to lie; to exaggerate; to waste time.can be used as a verb. "Nigga why you jaggin?" "You jagged the fuck outta that story." "Jag on your own time." jag by BoxedYance February 9, 2012 0 0 Get merch Get the jag mug. Buy Now — $32.95 See more merch