dirty 100 Share definition Flag when a guy shits on girl and writes out 100 on her stomach while jerking off, then jizzes on the girl re-writing the 100. ;) woww i cant believe he gave you a dirty 100! dirty 100 by gbreeze February 27, 2011 0 0 Get merch Get the dirty 100 mug. Buy Now — $32.95 See more merch