McDonald’s Japan has an exciting new burger! The ヤッキ burger. Or as you would pronounce it in English – The Yucky burger.
People in Japan have been pointing out this bad burger name, noting that “yakkii” sounds like “yucky” and explaining what “yucky” means in Japanese. The definition most people are referring to is “mazui” (そごくまずい) or “very unappetizing.” – Kotaku