A third wheel; a person who tags along with a couple during a romantic outing. (The expression likens the awkward third person to someone wearing a large, conspicuous hat that makes them stand out).
1. Juan is playing the third wheel como mexicano for Rosa and Ramon. 2. I am not going, no, just to be como mexicano.
A person who has a one-of-a-kind first name that no one else shares. (In the Dominican Republic, it is common for parents to invent unique names for their children by combining syllables or using original spellings).
Ruelsin is a sintocallo, that name is unique. Why? I just invented it now.
You are doing your thing, staying focused, or handling your business. It is used to acknowledge that someone is on their grind or doing well in their own affairs.