While there is no concrete evidence to support this theory. It is widely believed that the term Goofy to describe a right foot forward stance is based on a Disney Cartoon starring the beloved Dog character of the same name in a 1937 short titled Hawaiian Holiday. In this cartoon, Goofy is surfing and stands on the board in this exact stance, hence coining the term goofy. However, it could also be down to the fact that this stance is considered rightly or wrongly to be the least common of the two stances and hence, was given a somewhat derogatory name. I guess we will never truly know.