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Derived from the native tongue of Tignish, Prince Edward Island. Weak is a slang term used frequently in sarcasm. Referring to a "Weak Size Fish" would mean a really big fish. It most commonly stands for the Fredericton based musicians called Weak Size Fish, with a few of their members hailing from the town of Tignish, PEI.
Welsir you caught the weak size fish eh?

I caught the weak size fish the other day.
by JohnPierre March 09, 2012