Anything goofy is ridiculous and cute, like a squirrel on a skateboard or a big football player snuggling a teddy bear after every touch down. Goofy things are often well-intentioned but weird.
Being awkward, telling dumb jokes and stories, or wearing crazy clothes are all great ways to be goofy. A goofy smile is sweet, unless you’re in England where it means you have big crooked teeth. Goofy, the dopey Disney dog who is all of these things, was created in 1929 when the word was brand new. It comes from a variation on the English dialect goff, "foolish clown."