fish-brained

Having very short term memory.

From 50s Britannia Episode 1: Rock 'n' Roll Britannia. "They (UK record executives) were very much geared towards making records the either were going to appeal to an adult audience and, therefore, might have a slightly longer shelf life, or were going to appeal to young people, who were notoriously fish-brained and they would forget something within two minutes..."

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