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Language is a living medium and retarded "intellectuals" trying to capture it, frozen in time to some arbitrary point in its existence are simply fools.
Is the word "Unironically" widely understood across the English speaking world? Yes. It's a word. The end.
>B-but it doesn't follow these arbitrary rules me and my language nerd friends made up!
It's understood and represents a idea people seem to easily and readily embrace. That means your rules are incorrect and need to get adapted.