quibberfluff

Quibberfluff (noun) - The imaginary, ethereal substance that accumulates in the corners of one's mind when trying to remember where they left their keys, causing temporary confusion and mild frustration. Often blamed on mischievous brain gnomes playing hide-and-seek with important thoughts.

"I was in a hurry this morning and couldn't find my keys anywhere; it must have been those pesky brain gnomes spreading quibberfluff again!"