In Spanish slang, 'buñuelo' is often used colloquially to refer to a person who is clumsy or not very skillful. It originates from a traditional Spanish pastry of the same name that is thought to be easy to mess up while making.
Examples
- Spanish: No le dejes el coche a Juan, es un buñuelo conduciendo.
- English: Don't let Juan drive your car, he's a real klutz behind the wheel.