1.Verb. To crash. Usually but not limited to a bicycle or motorcycle. Short term for "end over end" or "end over the front" First coined a term in the mid 1970's it has gained several meanings included it's 1990's Urban noun usage for marijuana. Cars and trucks can do an endo as well as any moving object such as the human body.
I saw this kid get trashed at the dunes today... he took a wicked endo after he missed the jump.
At the races a car crashed and did 5 endo's before stopping.