A hot cookie can be used as a verb (I was hot cookied), a noun (I ate a ridiculously hot cookie), an adjective (She's so hot cookie!) and an adverb (He ran hot cookiedly). It describes anything ridiculously moist and can be used in generally any context where moisturous things are involved. Or crunchy things for that matter. It is really a universal word but best used in a thick foreign accent. Hot cookie transcends languages. It can become a sexual innuendo or a religious saying. For example, "Jesus was a real hot cookie on that cross!". It can even be used as an idiom "Oh man, I'm in DEEP hot cookie."
That hot cookie was moisturous!
So long hawt cookie, we'll crash and burn.
Hot cookie me yo!
Right out of the oven.
Boy, she's a hot cookie!