drop ballast Share definition Flag to have a movement of one's bowels; to take a shit (nautical in origin). Captain Pete grabbed a newspaper and headed for the shithouse. It was obvious he was going to cop a squat and drop ballast. drop ballast by Blenderhead1991 May 13, 2009 0 0 Get merch Get the drop ballast mug. Buy Now — $32.95 See more merch