How does Google listen to everything you say?

I imagine that officially they do not do this, but it is pretty clear that they do.

We were just talking about a company we saw advertised on a company car. It was called "wood urhulu" or something like that. Urhulu being a reference to something in a foreign language.

Point is, there is *no way* google should suggest Urhulu after I type wood.
How do they do it and is there a way to "turn it off"?

called car clear google language point privacy reference talking wood