1. A psychodelic experience caused by your body metabolizing LSD stored in the fat of your body after LSD usage in the past.

2. Jerry Garcia's revenge
Dude, is your face really that ugly, or is this another acid flashback?
by Biff Skippy February 07, 2010
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that sinking feeling in the pit of your stomach followed by the urge to hurl when you're confronted with a situation that made you feel the same way in the past.
Seeing my ex with her new b/f gave me a nasty case of acid reflux flashback.

I got a case of Acid Reflux Flashback when the cop pulled up behind me and turned on his lights for the 3rd time this week.
by Wolfie2k8 April 03, 2008
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