#hashtagvomit is when the number and length of hashtags in a social media post is equal to or greater than the length of the content itself.
Whether or not the post in question is good or bad is irrelevant. I don’t regard hashtags as content, but rather a subtext to the content, a type of metadata intended for human consumption. Hashtags ought to be used in the same manner as exclamation points in writing. To wit…
If a sentence really has something of importance to say, something quite remarkable, it doesn’t need a mark to point it out. And if it is really, after all, a banal sentence needing more zing, the exclamation point simply emphasizes its banality!
Notes on Punctuation, by Lewis Thomas