Japanese has the best words

[syniqal]

辻斬り 【つじぎり】 (n) killing a passerby in order to test a new sword

ごっつん盗 【ごっつんとう】 (n) (sl) stealing a car by rear-ending it lightly and having a friend jump in and drive off after the driver gets out

生首 【なまくび】 (n) freshly severed head

Nuff said…