When a person has a resting facial expression which is incredibly vacant and vaguely shocked. Suggesting the person is having a flashback to an experience had in the Vietnam War.
by 11jadaway August 31, 2016

Bob: Hey, remember our tenth grade geography teacher? She was so hot!
Joe: I still have Vietnam war flashbacks of when she caught me staring at her huge tits...
Joe: I still have Vietnam war flashbacks of when she caught me staring at her huge tits...
by moldovaball January 31, 2018

by Hrpy/ I luv nedyaj March 19, 2022

A flashback about something probally traumatizing like the apple alarm going off when your best dreams are happening or the Vietnam war
by urban dictionary is 4chan February 8, 2022
