Alignment tongue

alignment tongue, n., D&Dism: 1. In D&D and derivative fantasy RPGs, a language shared by creatures of a particular alignment.
Ex: Sure I can interrogate the orc -- my character speaks Neutral Evil. [GJ1]
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Addendum: A pretty dumbass concept, the idea was probably derived from the "Black Speech" used by the minions of Sauron in LOTR. More advanced AD&D players tend to abandon the whole idea. [GJ1]
Addendum #2: This idea was completely done away with in D&D 3rd. Edition. Now if you want to speak baddie, you have to put a few points into Demonic.