flonk donk Share definition Flag when she got a big booty on her, you refer to that as a killer 'flonk donk' Boy: dayyummm Liz you've got a nice flonk donker. I'd flonk that donk in a second!! flonk donk by flonker420 August 7, 2016 0 0 Get merch Get the flonk donk mug. Buy Now — $32.95 See more merch