It's not. Some folks get their panties in a wad at the slightest thing.
I think I'll get over it but...
It is any thread that has a title where the content cannot be discerned.
Some of us less intelligent board members (or maybe just me) couldn't tell what the title was referring to until after opening the thread.
In addition to the items listed in the OP, the rule against teaser titles is one of my favorites.