derogatory term for Finnish mostly, but it can apply to any language that the listener doesn't know.

The term originated from Americans listing to Finnish Metal (which in some circles is considered the best on a technical level) but having no idea what was being said in the lyrics; and because Finnish words tend to be long with many double vowels and carry a lot of accented letters. Trying to listen by ear and write it down to translate via Babble Fish or some other translator is damn near imposable, so through frustrations people just say "Moonspeak" and carry on.

Another way of saying Japanese. It is taken from Turn-A-Gundam, in which the Moon has it's own race of people.

Any language the speaker cannot understand, especially with writing unknown to the speaker, sometimes abbreviated as moon. Common in multinational IRC-channels where languages not understood by everyone sometimes are spoken.

Scientology speak, that is.
After reading this, it will enhance your Tom Cruise experiences.
Enjoy with caution.

A=============
ACK(-KNOWLEDGEMENT) of communication; "OK", "Thank you", etcetera.
ADMIN(-ISTRATION) cult bureacracy, laid down in great detail.
AFFINITY, cult word for love or liking.
ARC / Affinity Reality Communication: signifies "rapport".
ARCX/ARC BREAK: argument, cross puposes, abscence of rapport.
ARS / Alt Religion Scientology: newsgroup, mainly critical, about CoS.
ACT / Alt Clearing Technology: newsgroup for independent scientologists.
ARS-CC (Central Committe) secret cabal which is of course plotting all
activity on ARS financed by drug companies & the Markab Confederacy.

AUDITING: scientology confessional ritual; AUDITOR administers it.

b---------------------------
BANK, MEMORY- or REACTIVE MIND, stores up hurtful memories (ENGRAMS).
BARRATRY(English word), bringing lengthy and vexatious lawsuits.
BASH: favourite FREEZONE word for "criticise", to discourage analysis.
BEINGNESS: being something. Similarly DOINGNESS, HAVINGNESS.
BIG WIN: maginificent achievement, usually spiritual i.e. imaginary.
BILLION YEAR CONTRACT, for many lifetimes, signed in the SEA-ORG q.v.
BLOW: depart suddenly (fifties slang), leave the cult.
BTs/BODY THETANS: degraded spirits parasit...