"What's up, cousin? We're going tomorrow."
Here's a breakdown:
* Que pasa: What's up
* primo: cousin (masculine)
* Nosotras: We (feminine)
* Ida: Going (this is a shortened form of "vamos a ir" which means "we are going to go")
* ma ana: tomorrow
It's a casual and friendly way to say hello to a cousin and let them know you have plans to go somewhere the next day.