Sometimes some expressions in Spanish have nothing to do with those in English, that's why some spanish learners tend to confuse or even invent expressions like "doing the dog" (as last week said my pupils in class...) refering to "doing nothing at all...". Imagine what the American lecturer Ethan was thinking at that moment. It was very funny anyway...
Here you are a song that talks exactly about doing nothing. Enjoy and learn...:)
Have a nice weekend ;)!