The anus of a fish which, given that fish spend all their lives in water, would have to provide a very tight seal. Metaphorically, the term is usually used in conjunction with the words "tighter than a" to indicate that someone could hardly be more frugal with his spending.
Tom: "I never leave a tip when I eat out- even if the service was excellent".

Jerry: "Man, you are tighter than a fish's asshole".
by poo hole December 21, 2012

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