This is the 6500th most frequent Spanish word.
coi
"COI" is not a standard Spanish word; it may be a typo, abbreviation, or borrowed term.
Here, 'coi' is used as a short form or slang for 'científico ornitológico' meaning an ornithologist.
El coi estudia las aves en su hábitat natural.
The ornithologist studies birds in their natural habitat.
In this context, 'coi' is a colloquial term for a friend.
Me dijo un coi que prefiere el café sin azúcar.
A friend told me that they prefer coffee without sugar.
In this sentence, 'coi' refers to a type of small bird, used in regional dialects.