I have been influenced by my current environment in the selection of this word. I am thinking of it in the sense that "She yaks incessantly about a lot of nothing or a little of everything." My BBBH and her eldest daughter are on the other side of the room. They have been yakking for over an hour and their mills show no sign of flagging. Sometimes one talks, then the other, but frequently they are both talking at the same time. Ninety miles an hour.
Please, take a breath.
yak (v.) to talk uninterruptedly and idly; gab; chatter. You yak, she yaks, and so on.
Yaks is also a plural noun indicating large, shaggy-haired Asian buffalo.
For the ultimate four-letter word I have chosen
This is a wonderful word. Just makes one feel all perky, does it not?
zest (n.) relish, gusto, piquancy.
"I admire one who undertakes a task with zest."
Zest is also a culinary term referring to the use of the outer rind of an orange or a lemon for flavoring in certain concoctions.
"I used a grater to scrape the zest from the orange."