There are several synonyms for the phrase "made up as goes along," which refers to improvising or creating something on the spot without pre-planning or preparation. Other phrases that can be used include "winging it," "improvising," "ad-libbing," "spontaneous," "off the cuff," and "fly by the seat of one's pants." These phrases all have a similar connotation of doing something without a set plan or script, and they can be used in a variety of contexts, from public speaking to creative writing to everyday conversation. Whether you're a master improviser or simply trying to get through a difficult situation, these synonyms can help you express yourself in a more precise and dynamic way.