A waffle is essentially a crisp cake with a pattern of deep squares on both sides that is made by cooking batter in a waffle iron, a cooking utensil that has two hinged metal parts that shut upon each other and impresses the honeycombed pattern. It is often eaten with a topping of syrup, butter, sugared fruit, and/or whipped cream. The common breakfast food's name is from Dutch wafel and Middle Dutch wafele, which are akin to Old High German waba, meaning "honeycomb," and the Old English verb wefan, "to weave." English speakers began using it in the 18th century.
In American English, the verb waffle means "to be unable or unwilling to make a clear decision about what to do" (in other words, "to equivocate, to vacillate, to yo-yo, to flip-flop, to waver"), as in "The media pointed out the senator often waffled on the important issues." In British English, it means "to talk or write a lot without saying anything important or interesting"—"to blather." For example, you might say that you have a mate who waffles on about politics.
The British sense developed a noun form that means "foolish or dull talk or writing that continues for a long time."
The Chancellor indulged in the usual waffle about building a new relationship with the EU we’ve come to expect from ministers.
— James Moore, The Independent, 29 Oct. 2018
This noun and its related verb were both given voice in the English language in the 19th-century. The verb is from obsolete woff, meaning "to yelp." The etymology implies that people who waffle are similar to a barking puppy that can't communicate what it wants or needs.