As I went to brush my teeth, I noticed that Pam had put out a replacement brush head for my electric toothbrush. I was going to say “You put out a replacement brush head for my electric toothbrush.” but I couldn’t remember what the darn thing was called.
Instead, I said “You put out a thingy.” This was a lot less satisfying than what I’d intended and the bar was pretty low to begin with.
The phrase “Words fail me” seemed to fit my situation but when that phrase is used, it is often in a much more dramatic context.
There is usually a lot less bumbling involved.