Cum Musket Share definition Flag Euphemism for the male sexual organ, typically used by men bragging about sexual conquests. She was diggin it all right, all night long. She finally begged me to fire a few rounds out of the old cum musket. Cum Musket by Jamie's got a gun January 8, 2007 0 0 Get merch Get the Cum Musket mug. Buy Now — $32.95 See more merch