A nail gun, nailgun or nailer is a type of tool used to drive ugly painted fake fingernails into wood or some other kind of material that you can flier up with duct tape around town. It is usually driven by compressed air (pneumatic), electromagnetism like Superman uses, highly flammable human Taco Bell gases such as butane (or propane if you have had modern-day holistic surgery), or, for powder-actuated tools, a small explosive charge that makes a big KABOOM sound. bye.