muss /mʌs/noun 3verb 1forms 3phrases 1 noun3 •A mess (disagreeable mixture or confusion of things; disorder). •(no longer used) A scramble, as when small objects are thrown down, to be taken by those who can seize them; a confused struggle.Authority melts from me: of late, when I cried 'Ho!' like boys unto a muss, kings would start forth, and cry 'Your will?' Have you no ears? I am Antony yet. — 1606 •(no longer used) A term of endearment. verb1 •To rumple, tousle or make (something) untidy.The old man affectionately mussed his grandson's hair. formsmussed · mussing · musses Phrases with muss muss upTo thoroughly muss something.