koochie koo Share definition Flag used as slang for saying "my lover"; most often used when a girl is referring to her boyfriend or best friend in a joking manner koochie koo, come over here. I need to talk to you. or koochie koo, I love you! koochie koo by koochie koo May 18, 2008 0 0 Get merch Get the koochie koo mug. Buy Now — $32.95 See more merch