This fancy version of the burp came into use in the fifteenth century. Eructation is a medical problem for some and mostly it’s an expression of a satisfied stomach.
The word has been used in books in interesting ways:
“Slang, too, is the wholesome fermentation or eructation of those processes eternally active in language, by which froth and specks are thrown up, mostly to pass away; though occasionally to settle and permanently crystallize.”
― Walt Whitman
“Here at any rate is Ignatius Reilly, without progenitor in any literature I know of—slob extraordinary, a mad Oliver Hardy, a fat Don Quixote, a perverse Thomas Aquinas rolled into one—who is in violent revolt against the entire modern age, lying in his flannel nightshirt, in a back bedroom on Constantinople Street in New Orleans, who between gigantic seizures of flatulence and eructations is filling dozens of Big Chief tablets with invective.”
― John Kennedy Toole, A Confederacy of Dunces