"Get/have the hump" is a phrase that means to feel frustrated or annoyed. If you're looking for synonyms, there are several options to choose from. "Get/have the hump" is often used as a colloquialism, so other colloquial phrases that can be used interchangeably might include "get/have the huff," "get/have the pip," or "get/have the grumps." Other alternatives might include "get/have the blues," "feel disgruntled," "feel agitated," or "feel irritated." Whether you're choosing to use a colloquial phrase or a more formal option, there are plenty of ways to express your frustration when you're feeling "the hump".