Pet Iguana Share definition Flag Slang for an abnormally long penis, usually over 8 inches in its flaccid state, over 12 inches in its erect state. Girl, yesterday this fool showed me his pet iguana in the bathroom!! Pet Iguana by Prazzo July 16, 2009 0 0 Get merch Get the Pet Iguana mug. Buy Now — $32.95 See more merch