The feeling of ickiness the day after any vaccine. It could be a headache or low fever.

It is caused by your bodies immune response to the vaccine and shows the vaccine is working properly.
I didn't feel anything after the first covid shot, but the booster gave me a vaccine hangover
by Wordiculous September 30, 2022
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The side effects experienced after a covid vaccine.
Dude! This vaccine hangover has me feeling like I just got off a weekend drinking bender.
by Orbinator April 15, 2021
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