Top definition
When a Japanese person gets diarrhea. This is usually caused when eating too much food in Japan or which they are usually spicy or salty.

Other names include:
Ramen effect
Nagasaki fever
Teriyaki tummy disorder
Wasabi whoosh
or simply, jiarrhea.
Our Japanese friend has got another case of ramen effect, or Japanese diarrhea.
by My supplies from Slovakia June 13, 2018
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