Hey-go-mad is an interesting phrase that means to become wild or frenzied. When looking for synonyms for this phrase, we can use words that also convey this same sense of craziness. Some possible options include insane, manic, frenzied, berserk, unhinged, frenetic, deranged, wild, and uncontrolled. Each of these words captures the idea of losing oneself in the moment and letting go of all inhibitions. Whether it's dancing wildly on a dance floor or going on an adventure with friends, the sentiment of hey-go-mad can add a lot of excitement and fun to life.