Skidlid is a seven-letter term used to describe a crash helmet. It is a slang term for a protective headgear worn by motorcyclists, cyclists, and other people who are at risk of head injuries due to falls or collisions. The term is derived from the sound that a skidding lid makes when it hits the ground. Crash helmets are designed to protect the wearer's head from impact and provide cushioning against the force of a crash.