It is a Spanish version of English nerd. See chacon ( applied ), swallow ( swallow books ), nardo ( lunfardo ) .
NERDO In juvenile jargon, chiquillo NERD English word that refers derogatoryly to very intelligent young people but who have a poor ability to relate to people of the other sex, and even to those of the same. Synonyms of nerda are clumsy antisocial postme
In Colombia nerd, nerdo or nerda, is a way of calling who is very intelligent, person of great mental capacity and abundant knowledge. Very studious and prepared person. Colloquially it is called booklet, pilo or pepa.