chunky train Share definition Flag When a formally thin or skinny person gains a large to obscene amount of weight from the last time you saw them. I hadnt seen Jessica Simpson since Dukes of Hazzard, GIRRRL she got hit by the CHUNKY TRAIN!!!! chunky train by Sammiohfries January 26, 2013 0 0 Get merch Get the chunky train mug. Buy Now — $32.95 See more merch