cummerbund Share definition Flag A sash worn at the waist in formal events.For use with a tuxedo. Inadvertently sounds silly as hell, too Dood 1 : LOL that guy looks tight as fuck in his periwinkle cummerbund! Dood 2 : Yeah he does! cummerbund by Vasher00 May 12, 2007 0 0 Get merch Get the cummerbund mug. Buy Now — $32.95 See more merch