Top Definition
Not being able to remember many things during summer vacation, even the simpliest of things such as distinguishing from left and right and not knowing what day it is or the date. Usually wears off when school starts.
Sally: *puts a picture on Instagram with #ThrowBackThursday*

Angelica: *comments* Today is not Thursday, it's Monday.

Sally: Oh my gosh, I've been diagnosed with summer amnesia!
by kaliforniaqueen_ July 11, 2013
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