Kablooey is a slang word commonly used to indicate an explosive or sudden event. Though it is not a formal word, it is often used in informal and humorous contexts. There are a few synonyms for "kablooey" that one can use in such situations, depending on the context of the sentence. Some of these synonyms include "boom," "bang," "blast," "pop," "crack," and "snap." Other words that could be used as synonyms for "kablooey" include "burst," "detonation," "explosion," and "fireworks." All in all, these words convey the sense of suddenness and explosiveness that "kablooey" conveys.