Since it has "-ing" at the end, should I consider the word "f*cking" as a gerund? Or is it an adjective?

Native speaker’s answer
Rebecca
Here, "fucking," censored as "f*cking," is a present participle that functions as an adjective! It modifies the noun "cat sanctuary." Be careful, while the word "fucking" does add emphasis to certain things, it may be offensive to some and inappropriate in a few contexts! Ex: That was an exciting trip! Ex: What a fucking nightmare.