gooch grenade Share definition Flag It is the spot on the gooch that if tickled correctly causes an explosion of a mans testicles and/or asshole. Oh my god my gooch got tickled so hard that I (gooch grenaded) everywhere!!! gooch grenade by Gooch king February 1, 2014 0 0 Get merch Get the gooch grenade mug. Buy Now — $32.95 See more merch