When you get flashbanged or when you get a flashback of something inappropriate or something that you didn't want to remember, like a memory you wanted forgotten or something traumatizing. If you do get Akira'd it means that you got reminded of something traumatizing or inappropriate that you didn't want to remember, in the form of a flashbang or a flashback exactly like the famous Akira Meme 2001 Pioneer.
You: Brooooo
Friend: The f*ck wrong with you?
You: You know that time when I told you about me seeing my sister wear a tampon and she moaned with it?
Friend: Ye what about it?
You: I just got like flashbanged or I just got a flashback about that specific time.
Friend: That means you just got Akira'd bro. And shame xD
When you get flashbanged, flashbacked or reminded of something you didn't want to remember. Exactly like the Akira meme. When you get Akira'd you get reminded of something you wanted to forget like Akira, this could be embarrassing moments, cringy or corny moments, inappropriate moments etc.
YOU: Yoooo bro.
Friend: What's up?
YOU: I just got reminded of something I didn't want to remember, it reminded me in like a Akira template kinda way
Friend: You just got Akira'd