scrotum lagoon Share definition Flag a swampy accumulation of sweat under one's scrotum after a long period of crotch heat. Nate spent so much time with his laptop on his crotch that he got scrotum lagoon! scrotum lagoon by Minxy Noodle December 15, 2011 0 0 Get merch Get the scrotum lagoon mug. Buy Now — $32.95 See more merch