Belgium Gas Mask Share definition Flag While embarking upon a sixty-nine postion with your partner, you fart in your partner's face. While John was 69ing his girlfriend, the burrito he ate earlier caused him to fart and give her a Belgium gas mask. Belgium Gas Mask by Troy Knudsvig December 1, 2007 0 0 Get merch Get the Belgium Gas Mask mug. Buy Now — $32.95 See more merch