T-Rex dick Share definition Flag When a really big guy has a large cock, but it looks small due to his over-all size, much like T-Rex's arms. My cock is seven inches, but I'm 6'7", so it looks kinda dinky. I have a T-Rex dick. T-Rex dick by Alex Stockwell April 23, 2008 0 0 Get merch Get the T-Rex dick mug. Buy Now — $32.95 See more merch