shwaboom Share definition Flag The sound a massive penis makes when it either moves around or makes contact with another object. Also the sound of whipping aforesaid penis out. "Woah, I just tripped on something when I walked in." Shrug, "Shwaboom." shwaboom by jds6 May 5, 2009 0 0 Get merch Get the shwaboom mug. Buy Now — $32.95 See more merch