co·ag·u·late kōˈagyəˌlāt/ verb
Coagulate is a verb that means to change from a liquid to a solid or semisolid state. It is often used to describe the way blood thickens into a clot.
I left a can of soda on my desk for a few weeks, and when I finally got around to pouring it out, it had coagulated into a goopy, slimy blob.
In this sentence, “coagulate” is being used to describe the drink’s transformation from a liquid into a semisolid glob. The meaning of the word can be deduced by noticing the description of the drink’s final form (a goopy, slimy blob).