Lodestone

[Britney]

A piece of magnetic iron ore possessing polarity like a
magnetic needle. See Magnetite.

[Dave Paprocki]

lodestone |ˈlōdˌstōn|
noun
a naturally magnetized [mineral], able to be used as a [magnet].
• figurative a thing that is the focus of attention or [attraction].

[Cami]

The act of expelling a [kidney stone] while ejaculating on to the face of another… where in [the stone] fires out of one’s penis like a [musket ball].