Celu – slang for cell or mobile phone. Celular is the correct word.
Cletar – to ride a bike. Montar en bicicleta is the correct way of expressing this idea. We also say volar pedal here.
Echarse el equipo al hombro – figuratively to carry a team on one’s back.
Estar añejo/a – to need a bath. Añejo usually means aged like wine or liquor.
Guada – abbreviation or slang for San José’s suburb of Guadalupe.
Guato – slang for dog. Zaguate is also used. Perro is the correct word.
Hacer pichuelos – to do odd jobs. Camaronear is also used for this kind of work.
Jaus – slang for house or casa.
Maicucha – marijuana
Pura carnita – means something is good like tuanis, pura vida or solo bueno
Puros tenis – means the same as the last example
Tirar la toalla – to throw in the towel of give up. Darse por vencido is also used.