Dumdum bullet

[Sarah]

A kind of manstopping bullet; -- so named from Dumdum, inIndia, where bullets are manufactured for the Indian army.

[Tracie Lynn]

a bullet with a soft front that increases in size when it hits someone, causing serious injuries

[Zipporah Schumaker]

[gay slang] for a particularly large penis, so named because of the supposed damage it does to [internal] organs during [anal intercourse].