mardi bras Share definition Flag The bras that get tossed in trees slopeside at every ski slope. Dude -- check those Mardi Bras out, they're all grey and tattered cause they've been hanging there all year long. mardi bras by Cmackg March 18, 2008 0 0 Get merch Get the mardi bras mug. Buy Now — $32.95 See more merch