Submuncher Share definition Flag A term used to exemplify a persons excessive and often obsessive ingestion of varyingly filled Subway Sandwiches. Danny: A Sub! Yessah!! Me: o.o; Danny: o_o Me: You Submuncher. Submuncher by Nyan-Lover June 28, 2005 0 0 Get merch Get the Submuncher mug. Buy Now — $32.95 See more merch