Excessive talking, sometimes
to the point where it gets boring and drags on for way too long, aka rambling.
It's a slang word used in Britain, but mainly in London or other parts of England by roadmen / younger
generations.
"Bro my
Psychology teacher is so boring, they're always waffling about nonsense that has
nothing to do with the lesson."
"I definitely failed that History test, I just waffled tbh."
"That Biology question was so long and
irrelevant, there was so much waffle in it I barely knew what they were asking me to do."