The story
Blend of dash(board) + cam(era).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A digital video recorder mounted on the dashboard of a vehicle or elsewhere inside the vehicle to record occurrences in the vicinity, such as traffic accidents that the vehicle has been involved in, to provide evidence for criminal prosecutions, insurance claims, etc. Full definition →
Blend of dash(board) + cam(era).
Etymology from Wiktionary, CC BY-SA 4.0.