Dead Money" business, you might be under the impression that it's actually the name of some kind of new, SoCal-based hip-hop dance crew. This impression is wildly incorrect. It's actually the name of a DLC expansion to Fallout: New Vegas that's been available on 360 since December -- though your native console has access to it starting today.
The DLC is available now on Steam, and will arrive in the PlayStation Store update later today. It's all yours, provided you've got $9.99 to spend -- which is kind of appropriate, since it would more or less make that money "dead." Well, dead to you, anyways. Bethesda will find said money quite alive.