"Gat cracking" is a slang term that refers to the sound of a gunshot. There are several synonyms that can be used in place of "gat cracking," such as "gunfire," "gunshot," "bang," "blast," "pop," and "report." Each of these words can convey the sound of a gunshot in a different way, depending on the context and tone of the scene. For example, "gunfire" has a more intense and sustained connotation, while "pop" or "report" might be used for a softer and more subdued gunshot sound. Regardless of the word choice, the meaning and impact of the sound remains the same.