* A misspelling: Perhaps you meant a similar word like "mattiamo" (Italian for "we love") or "matias" (a name).
* A regional dialect: It could be a word used in a specific region or language group.
* A made-up word: It's possible it's a word someone invented for a specific purpose.
To get a better understanding of "matiamo," please provide more context:
* Where did you encounter this word? (e.g., a book, song, conversation)
* What was the surrounding text or conversation?
* What language do you think it might be from?
With more information, I can help you understand what "matiamo" means.