Slow returning embarrassing memories/flashbacks from drinking too much the night before
"My hangover is awful and I keep getting cringe-worthy blithms. I'm so embarrassed!"
or "I've just had the worst blithm! Did I really dance on stage and snog the ugly DJ?!"
A Blithm Blithms can happen hours, days, weeks months and, in extreme cases, years after a drunken night.