It's a powerful statement that expresses a sense of complete and total identification with something. It can be used to:
* Express strong belief or commitment: For example, "I am all for this cause" or "I am all in with this project."
* Emphasize a feeling of unity or belonging: For example, "We are all in this together."
* Convey a sense of personal power or self-confidence: For example, "I am all I need."
It's important to note that the meaning of "kol ami" can vary depending on the context.