Bachelor Brush Share definition Flag the act of brushing your teeth with a bare toothbrush because you don't have time or just ran out of toothpaste Dude1: I woke up this morning with only 10 minutes to get to work... i had to bachelor brush Bachelor Brush by CBJDoe September 13, 2009 0 0 Get merch Get the Bachelor Brush mug. Buy Now — $32.95 See more merch