Here's why:
* "Eh" is not a typical word in formal Portuguese. It's sometimes used informally to express surprise or agreement, similar to "huh" in English.
* "Nois" is a slang version of "nós" (we). It's primarily used in Brazilian Portuguese, especially in informal settings.
Possible Meanings:
It's impossible to say for sure without more context. It could be:
* A way to say "we're here" or "let's do this." In this case, "eh nois" would be similar to "let's go" or "we're in."
* An expression of solidarity or camaraderie. It could be used to express a sense of belonging or to show support for a group.
* A playful or ironic statement. The meaning could be dependent on the tone and context of the conversation.
To get a clearer understanding of the meaning, you need more context. Where did you hear this phrase? What was the situation? Who said it?