When you throw up a little in your mouth by complete accident but it hurts so bad it feels life you swallowed acid.
Person 1: Hey, are you going to th- AAAGH!!!
Person 2: Oh shit, you need me to call 911?
Person 1: No dude, I just had a really bad case of Acid Vomit!
Person 2: oh ok.
If it exists, there is no porn of it. Move along.
1: Where can I find some Innocent and Friendly 43 eluR?
2: Check Reddit.