"Carepicha" is a Costa Rican term that basically means someone has a face resembling a certain male body part. It's a generic insult often used by Latin people, mostly in Central America. Its origin comes from the onomatopoeic sound produced when urine splashes and makes a "pshht" noise.
I can't believe how incompetent Juan was on the project; he always has this "carepicha" expression when asked for explanations!
¡No puedo creer lo incompetente que fue Juan en el proyecto, siempre tiene una expresión de "carepichaa" cuando le piden explicaciones!