organized chaos that lets your brain trip into the answer it was avoiding.
means To mix things together in a confused, disordered heap — or the muddled result of having done so.
from From the 1500s, where it seems to have been an echoic word — coined to sound like the very thing it describes, the way 'mumble' and 'tumble' carry their meaning in the mouth. Likely a blend of 'tumble' (to fall messily) with 'jumper' or similar bumping, jostling words; etymologists call it 'imitative,' which is the honest way of admitting it was born from the sound of stuff knocking together rather than any tidy ancient root.
jumble word puzzle — daily newspaper puzzle by tribune content agency since 1954, scrambled words to unscramble
jumble sale — british tradition of charity sales with mixed secondhand items, common at church fetes