"C'mon" is an informal, short form for "come on" which is used for urging someone to do something or to express disbelief or disappointment. There are a few synonyms for the phrase, including "let's go", "hurry up", "come along", "get moving" and "step on it". Depending on the context, other expressions can stand in for "c'mon" as well, such as "seriously?", "are you kidding me?", "no way!", "you've got to be joking", and "oh, come off it". While these phrases might not be exact substitutes for "c'mon", they convey a similar meaning, and can be used interchangeably in certain situations.
