A person who lives as a moocher or a parasite. It refers to someone who does not work and is always sucking up to others to live off them.
A: Have you noticed that crazy girl is always carrying high-end phones without working or anything? B: Yeah man, that girl is an Arrecota. She gets those by sucking up to the Dominican-Yorks (Dominicans living in New York).
A grown person who behaves like a child or engages in activities meant for kids. It generally refers to someone who is immature or foolish despite being an adult.
Hey man, get off that kid's little bike, you look like a manganzón.