Here's a breakdown of the phrase:
* Como así: This part translates to "how so" or "how come." It expresses surprise or confusion at something someone has said or done.
* Nicolás: This is the name Nicholas in Spanish.
The phrase is often used to express surprise or disbelief, as if the speaker doesn't understand why something happened or why someone said something.
It's important to note that the phrase is informal and often used with friends or family members.