English

Noun

moon language ‎(plural moon languages)

1. (slang) Text written in an incomprehensible script, especially Japanese or Chinese.

See also

• moonspeak
• moonrunes

Usage notes

When one's opponent in an argument is observed to use ridiculously silly reasoning and logical fallacies, one might accuse them of speaking moon language (even if their grammar and language is perfectly good English, etc.)