Forelength Share definition Flag The added length one gives to his penis, often used in exaggeration when one knows they are in possesion of a small penis. Man 1: Bro, my dick is 9 inches soft!Man 2: Maybe with forelength. Forelength by HalfBreed15 December 8, 2011 0 0 Get merch Get the Forelength mug. Buy Now — $32.95 See more merch