made in Japan
Definition from Wiktionary, the free dictionary
- (literally) Manufactured in Japan.
- (idiomatic, archaic) [c. 1950s-1970s] Of poor or low quality.
- (idiomatic, archaic) [c. 1950s-1970s] Cheaply manufactured in East Asia.
manufactured in Japan
Usage notes 
The quality of Japanese products has improved dramatically since the mid 20th century and they are now generally considered to be of usually very high quality. Thus the idiomatic uses of the phrase are now considered archaic.