The term voodooing is only used in multiplayer replays. It is when you dismember your opponent with a dismembered limb of your own. An example would be if you lost your arm in a kickboxing match and you happen to be grabbing your opponent with said arm. If you contract or extend that arm and it happens to dismember your opponent even if your head and core body are nowhere near him, it is considered a "voodoo" dismemberment. I haven't actually heard this term used in ages, though, but that is what it truly is.
The definition that you gave us doesn't necessarily have a term. As War_Hero explained, you need to make damage = 1 for you to be able to cause damage to yourself.