schlong sundae Share definition Flag A good sized penis dipped in ice cream with fudge (the kind you eat), whipped cream and a cherry on top. Dude, I'm craving a schlong sundae. Yeah...me too. schlong sundae by Ashley McSchlong January 1, 2006 0 0 Get merch Get the schlong sundae mug. Buy Now — $32.95 See more merch