Spin a windy is a casual term that refers to someone telling a long-winded or exaggerated story. There are several other synonyms that can be used in place of this phrase. For instance, one could say that someone is "spinning a yarn," which has a similar meaning. Another option could be "rambling on," which implies that the person is going off on tangents and not sticking to the point. Alternatively, someone could be described as "blowing smoke," suggesting that they are intentionally misleading or exaggerating. Overall, there are numerous ways to describe someone who is telling a tall tale, each with its own connotations and shades of meaning.