1. Wheelbarrow: This is the most common meaning of the word. It refers to a simple hand-powered cart with a single wheel, used for carrying loads.
2. Car: This meaning is less common and usually refers to a car in a more informal or colloquial way. It's often used in a humorous or slang context.
So, depending on the context, "тачка" could mean either a wheelbarrow or a car.