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個人的にこういうカチッ！っと決め決めの男性がタイプです
It's a woman commenting a picture of a young man.
I think 決め決めの means something like "determined", "resolved". It doesn't seem to be a real word because I can't find it. I've found 決め that means "agreement" and I've thought that maybe she doubles it to add emphasis, but I don't know how much "agreement" and "determination" are related...
Also, doesn't カチッ！と require a verb to be attached to 男性? I'm confused.
This 決め決め (also written as キメキメ in katakana) is from 決める in the following sense:
決める
Ichidan verb, Transitive verb
6. to dress up; to dress to kill; to dress to the nines
決める
６ かっこうよくぴったりした服装をする。「紺のスーツで―・める」
決める refers to neatly wearing attire such as a suit, uniform, costume or dress, or applying makeup suitable for some important occasion. It often refers to wearing formal attire, but depending on the situation, it can also apply to high-end clothes for a date, cute stage costumes, or even a Santa Claus outfit. 決まってるね means "You look sharp / put together!"
And 決め決め is a mimetic word that describes this. 決め決めの男性 alone could broadly apply to people who are always dressed like Instagram influencers or fashion magazines, but since it also has カチッと, I imagine mean who are dressed in formal attire or something like this.
カチッと is indeed an adverb, but 決め決め is a no-adjective here, and an adverb can modify a (no-)adjective, too. カチッと決め決めの男性 (adverb-adjective-noun) is structurally the same as とても面白い本.
