Clean as a whistle Share definition Flag When you wipe your butthole after taking a dump and the toilet paper comes away stain free. Hey man, i just took a huge dump but i was too tired to wipe my ass, good thing i was clean as a whistle Clean as a whistle by slippychunks September 29, 2010 0 0 Get merch Get the Clean as a whistle mug. Buy Now — $32.95 See more merch