The story
From moon + -speak; probably derived from the anime Turn A Gundam (1999–2000) where the inhabitants of the Moon, known as the Moonrace, have their own language, called Moonspeak by fans.
Etymology from Wiktionary, CC BY-SA 4.0.
moonspeak
Today it means: Any foreign language deemed confusing by the speaker, especially Japanese or another East Asian language. Full definition →