boxernut Share definition Flag Sudden,agonizing pain caused when a man's balls get caught up and twisted in the pair of boxer shorts that he is wearing. Everthing was OK until Jake bent over to pick something up,and got a sudden case of boxernut. boxernut by mohctep August 22, 2011 0 0 Get merch Get the boxernut mug. Buy Now — $32.95 See more merch