New Zealand phrase describing a person who is a renowned shit talker, or one who promises something only to let you down. Derived from buying a piece of deep fried fish only to find that the majority of it is greasy, oil-laden batter, and not fresh, white fish.
John thinks he can do a standing back flip. No way mate, he is no fish all batter!

Rhys keeps telling all his friends that Arsenal have a chance at winning the premier league, what do you think? HAHA what a no fish all batter muppet!!
by SmileyChatts September 16, 2014
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