boo goo Share definition Flag When you scare someone so badly that thay cum in their pants, it is called "boo goo" Lani screamed like a girl when I jumped out at him, and now his pants are full of boo goo. boo goo by Joeittonlay October 17, 2006 0 0 Get merch Get the boo goo mug. Buy Now — $32.95 See more merch