donut

1 :  a small usually ring-shaped piece of sweet fried dough

2 :  something (such as a mathematical torus) that has a round shape like a doughnut

3 :  a controlled skid that sends an automobile into a tight circle of at least 360 degrees —usually used in the phrase do doughnuts Doing doughnuts? You haven't heard about this? This is what they steal the cars for. Top speed, they slam on the brakes, yank the emergency brake, twist the steering wheel, and the car starts spinning. Wheeling the car in circles at tremendous speeds. — Philip Roth