Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ho-hum is an adjective meaning "so lacking in interest as to cause mental weariness". It carries one recorded sense.
so lacking in interest as to cause mental weariness
“a boring evening with uninteresting people”
“the deadening effect of some routine tasks”
“a dull play”
“his competent but dull performance”
“a ho-hum speaker who couldn't capture their attention”
“what an irksome task the writing of long letters is”
“tedious days on the train”
“the tiresome chirping of a cricket”
“other people's dreams are dreadfully wearisome”
Definitions, synonyms and semantic relations for ho-hum come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.