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You seem scary happy.
That house is scary big.
Not sure if I am over-reading it, but it seems to me here "scary" functions in the capacity of adverb modifying the adjective that follows: happy in a scary way; big in a scary way. That they don't follow the normal adjective ordering also indicates they are not coordinate adjectives.
So are they accumulative adjectives? I am not so sure. I am trying to think of other similar examples, but haven't found any off the top of my head.
At the risk of committing an opinion, I should suggest this. Apart from certain adjectives which are recognised as also having a standard adverbial use (‘fast’, for example), many adjectives are used in that way. The example you give is one among many. under the entry ‘scary’, dictionaries do not offer a separate entry under the grammatical category ‘adverb’. So it is not a recognised standard use of the word. In that sense, it is not standard British English, or, I think, in US English, though my impression is that it is more widespread ‘over there’ than ‘over here’.
But it is possible that at some future time it will become standard. That is only a prediction, based on the fact that, love the adverbial use of ‘scary’ or hate it, the intended meaning is glaring obvious.
One, at least, has made it into Merriam Webster: real
adverb Collegiate Definition (Entry 2 of 5) chiefly US, informal : VERY, REALLY —used as an intensifier It was a good furnace all last winter, they didn't have a single problem with it: it ran real quiet … — Garrison Keillor … the magazine isn't real sure who its readers are … — Tom Carson
I could use the adjective ‘big’ as an adverb.
During my stay in Las Vegas, I won real big at roulette.
That use of ‘big’ is common enough to have made it into Merriam Webster.
adverb Collegiate Definition (Entry 2 of 3) 1 a : to a large amount or extent won big b : on a large scale think big 2 : in a loud or declamatory manneralso : in a boasting manner talk big
It's heavily idiomatic, to such an extent that it strays into the category of slang.
But you are correct, "scary" directly qualifies the adjective, so in this context it acts as an adverb.
For grammatical correctness, the word "scarily" (or better: "frighteningly") would be used -- but there is no intention to be grammatically accurate here, this comes across as children's prattle.
It literally means "You seem so happy it scares me" etc., but it is unlikely that is what the writer really means. It is probably just a teenage affectation, hyperbole for "very".
