Ganni Guggu Share definition Flag People who pee in their pants even after the age of 5. *kid over age 5 pees in pants*Eww, that kid is a ganni guggu! Ganni Guggu by GeiGaiGan October 21, 2010 0 0 Get merch Get the Ganni Guggu mug. Buy Now — $32.95 See more merch