"stubborn"

There's probably a word for it in German or Swedish. I bet it's long and hard to pronounce, maybe with a non-English pronunciation symbol.

sometimes it's something that can't be looked up like a song tune or a scene from a show. i tried searching once using humming and it didn't work, but thankfully it only took a couple days for me to remember where it was from

Generally it is literally called a “tip-of-the-tongue” state in psych literature. Presque vu is the “fancy” french term for it, and means almost seen, similar to deja vu (already seen).

E: as a sidenote, I am fairly sure Vsauce had a video on this.

I thought the post title was a joke. Like you couldn't remember the word you were thinking of to describe when you can't think of a word.

Is there a word for when there's a word that's on the tip of your tongue but it turns out the word doesn't actually exist?

Something like onamanfuckmeah

I always experience a phenomenon in which no matter how hard I wrack my brain trying to think of the thing that's on the tip of my tongue, as soon as I go to look it up or ask somebody, it suddenly comes to my mind right before they tell me the answer.

Brain fart.

CRS syndrome.

Sounds like it could be called "trivial pursuit"