Green’s Dictionary of Slang

1. of a vehicle, to run into the back of another.

1959		M. Belli Modern Trials 4 875: Plaintiff, rear-ended while stopped behind a line of cars waiting to turn left, was hospitalized two weeks with back sprain.
1966		Jet 3 Nov. 29: [of a human hit by a vehicle] I wasn’t confronted — I was rear-ended,’ the plaintiff quickly replied.
1975		Pop. Mechanics Aug. 106/2: If you have to brake or swerve suddenly, you'll be able to do so with consideration for the traffic behind and possibly avoid being rear-ended.
1980		H. Ellison All the Lies in Shatterday (1982) 183: The Chevy caught up [...] The culeros rear-ended him.
1993		T. Jones Pugilist at Rest 196: The bus driver was quarreling with the driver of the truck that had rear-ended the tour bus.
2000		Guardian G2 15 May 16: I’ve been rear-ended twice, resulting in serious physical injury.
2011		K.R. Ball Terry the Tramp n.p.: A truck rear-ended the narrow, chromed out Harley chopper, killing his girl instantly.
2019		C.D. Rosales Word Is Bone [ebook] I nearly rear-ended the Cutlass stopped to turn left.

2. to have sexual intercourse in the rear entry position.

1995

J. Stahl Permanent Midnight 18: Some slinky lovely is on hands and knees getting rear-ended.