noun: 1. An eccentric or crazy person. 2. An ornamental typographical symbol, such as ?, ?, ?, ?. 3. An object, such as a brick, used as a missile. 4. A gadget or an object whose name is unknown or forgotten. Aka, thingamajig, gizmo, etc. 5. A two- to three-story boxy apartment building with parking spaces directly under it. adjective: Eccentric or crazy.