This is the 4473rd most frequent Catalan word.
mico
Monkey.
Here, 'mico' means a monkey, referring to the animal.
El mico salta de branca en branca.
The monkey jumps from branch to branch.
Here, 'mico' is used colloquially to describe someone who acts playfully or foolishly.
És un mico, sempre fent tonteries.
He's a joker, always messing around.
In this context, 'mico' refers to a fur piece or a similar warm fabric on garments.