loo loo loo means: These are the first three words from Leopold Scotch’s, aka Butters trademark song. Goes: Loo loo loo! I have some apples You’ve got some, too! It ends with one: Let’s be together, loo loo! What can we do? Loo! or: Let’s make applesauce, loo loo! Get out of your clothing and go loo loo! This song is performed when the child is playing or doing chores such as shoveling snow. He also practises singing it for the talent show. (in Community Dictionary, added by Wesley Bright)