European/Australian term commonly used to say someone has been killed and stuffed in the trunk of a car.
This is due to the fact that Euro/Aussie lingo refers to the trunk of a car as the "Boot.";
To kill a person and put the body in the trunk of a car;
A violent murder resulting in someone's body ending up in the trunk of a car.
Tim: You better watch your mouth, mate! I'll come boot you!
Eric: You can't do a bloody thing to me.
Tim: Just you watch, I already Booted your brother!
Eric: You bloody bastard!