I haven't heard of this, so is it in relation to a "boom" in google trends? I.E something that is trending rapidly due to a high number of searchers?
The word Google boom and Google washing refer to practices proposed to control the ranking of particular pages in outcome returned by the Google search engine, in arrange to boost the probability of people finding and clicking on selections in which the person or other article engaging in this practice is interested.
I don't think the term Google Boom really exists or at least as of now. It might just be another term used by some webmaster to name some experiences they've had with Google.
I think you mean Google Bomb??? Google bomb is an off-page black hat technique to influence a website ranking using a specific term that is funny or unethical. You can read more about it here: Google bomb