Beardmine Share definition Flag (n): a previously unknown pimple that suddenly explodes while scratching your beard. While doing his usual chin scratch, John stumbled across a beardmine in his goatee that shot puss everywhere. Beardmine by Waylan P. Dingleberry January 19, 2012 0 0 Get merch Get the Beardmine mug. Buy Now — $32.95 See more merch