To be alert

Agüevazón is a type of letdown or a feeling of disappointment.
Arañitas literally means small spiders, but can refer to a type of varicose veins.
Ateniense is a person who from the mountain town of Atenas
Bajarle el humo a alguien means to put people in their place.
Caite is slang for shoe. Cachos is also used at times.
Chocosca is slang for money. The terms harina and mosca are also used here.
Dar cátedra is to teach someone a lesson figuratively
Domingueño/a is someone from Santo Domingo, Heredia.
Estar a puro té de tilo is to be nervous
Estar ojo al cristo is to stay alert. Pelar el ojo is also used to mean the same thing.
Guarera is a drunken spree
Irse de pollo is to do something stupid or to be made a fool of.
Jalonazo is an electric shock.
Mordiscos or piques are drag races in cars
Ponerse chúcaro is to get very angry. The verbs enojarse or ponerse bravo are synonyms.
¡Que cáscara! means What nerve!
¡Qué color! This expression is, How embarrassing!
Tapis is to be drunk but can also can refer to a drink of liquor.