JFAH
Acronym for Just For A Horror. A hasthtag used to annotate a social media post which is silly, possibly improbable, and fun. The hashtag is used to ward of serious counters to what's in the post from nerds and folks with a stunted sense of humor.
I posted a joke about how I can turn water into metal. Some people who didn't get the joke wrote big comments about how it is scientifically impossible to do that. Man, I'd forgotten to put #JFAH tag in my post!