- One who drives quickly or without subtlety, one who often engages in and/or is fond of slamming and flooring the accelerator often.
- The leadfoot screeched to a stop inches from the tree.
- A driver that does not compensate the throttle position of his vehicle for road conditions or terrain, invariable slowing down while going uphill (irritating other drivers), and speeding up while going downhill (preventing other drivers from passing), as if his foot were "made of lead," thereby "preventing him from adjusting the throttle's position."
- Out of the way, LEADFOOT!!!