testosterretard Share definition Flag A male rendered stupid by his hormones (sexual or aggressive), whether temporarily or long-term. Hey look, Mitch is trying to impress Amy by baiting our neighbors' rottweiler. What a testosterretard. testosterretard by seraphTuck July 10, 2014 0 0 Get merch Get the testosterretard mug. Buy Now — $32.95 See more merch