The word "yoohoos" is an informal term commonly used to describe crazy or energetic individuals. There are a variety of synonyms that can be used to replace this term, such as nutjobs, loons, zanies, and lunatics. Other options include goofballs, wackos, screwballs, and oddballs. All of these words can be used in similar contexts to describe people who exhibit eccentric or unpredictable behavior. While the tone of these words can be playful or humorous, it's important to use them carefully and with consideration for the feelings of others. As with any slang or informal vocabulary, it's important to choose the right word for the right situation.