pena fro Share definition Flag Referring to a large amount of pubic hair on a man, usually very bushy and "fro" like in appearance. "Dude, he's got a huge pena fro." "He should really trim his pena fro." pena fro by Ruthie and Elysia July 31, 2007 0 0 Get merch Get the pena fro mug. Buy Now — $32.95 See more merch