This is the 4137th most frequent Turkish word.
kocabıyık
A Turkish surname meaning "big mustache" or "large mustache."
In this sentence, 'Kocabıyık' is used as a proper noun, likely a surname or name of an individual.
Kocabıyık köyde yaşamayı tercih eder.
Kocabıyık prefers to live in the village.
Here, 'kocabıyık' is used as a descriptor, indicating something that is large or old.
Bu eski ağaca 'kocabıyık' derler, çünkü çok yaşlı ve büyük.
They call this old tree 'kocabıyık' because it is very old and big.
The word 'Kocabıyık' functions as a surname of a family in this context.