T-Rex head Share definition Flag When someone’s really aggressive but have nothing to back it up like the noble T-Rex’s stubby arms. Also they might bite you. Wow did you see Grace the other day when she couldn’t win the fight she bit her, what a T-Rex head. T-Rex head by Not Fergal. February 6, 2023 0 0 Get merch Get the T-Rex head mug. Buy Now — $32.95 See more merch