the tooth that scratches your unit when someone is giving you head. usually large and pronounced, may be accompanied by other phaggelteeth
The lady on the corner has one big front tooth, if you allow her to give you head, for the usual 5 dollars, you can be sure that it will not be as pleasureful as you had thought. May be accompanied by sores and bumps. It feels like someone is biting, and dragging as hard and fast as they can.