Bust Your Kneecaps Share definition Flag To fuck standing up so long your knees give way underneath you, as though they've been busted. And then Becca told me that she was gonna' bust your kneecaps for your birthday. Bust Your Kneecaps by Dating A Canadian 101 March 29, 2014 0 0 Get merch Get the Bust Your Kneecaps mug. Buy Now — $32.95 See more merch