Peenu Share definition Flag A Peenu is a noose used to transform one's fingers into penis' thus making the user a Pensi. Dude, he totally used a Peenu the other day. His fingers are like wangtastic. Peenu by Misfitus March 4, 2005 0 0 Get merch Get the Peenu mug. Buy Now — $32.95 See more merch