Here are a few possibilities:
* It could be a misspelling: It's possible the intended phrase was something like "aussi, mon" (also, mine) or "aussi, moi" (also, me).
* It could be a regional expression: There are many regional variations in French. It's possible "aussi mon" is a phrase used in a specific area.
* It could be a creative expression: The speaker might be using "aussi mon" as a unique way to express something.
To understand the meaning, you need more context. What was the situation when you heard this phrase? Who said it? What was the conversation about?
If you can provide more information, I might be able to help you understand what the speaker meant.