We found one dictionary that defines the word yesterday's fish and chips:

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1. yesterday's fish and chips: Wiktionary

Definitions from Wiktionary (yesterday's fish and chips) ▸ noun:  (colloquial) old news ▸ Words similar to yesterday's fish and chips ▸ Usage examples for yesterday's fish and chips ▸ Idioms related to yesterday's fish and chips ▸ Wikipedia articles (New!) ▸ Words that often appear near yesterday's fish and chips ▸ Rhymes of yesterday's fish and chips ▸ Invented words related to yesterday's fish and chips