slider Share definition Flag A slider is a large glob of cum that a guy shoots down his cocksucker's throat when he blows his load, instead of spurting several smaller cumshots. Matt sometimes floods my mouth with a slider when I suck his dick and it's hard to swallow it all! slider by USAF Cadet June 29, 2021 0 0 Get merch Get the slider mug. Buy Now — $32.95 See more merch