Etymology

mubble-fubbles

Today it means: The doldrums; the blahs; a downer; a mood of depression, dejection or melancholy. Full definition →

First used 16th & 17th c.
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The story

Not clear. Likely onomatopoeic. Possibly reduplication of derived from the then-used verbs mumble (“to mix up”) and fubble (“to jumble up”), or perhaps the slang term fumble (“to sexually underperform”). Compare mumble-jumble.

First known use, by meaning

  • 16th & 17th c. The doldrums; the blahs; a downer; a mood of depression, dejection or melancholy.

Etymology from Wiktionary, CC BY-SA 4.0.