"O-Hum" is a term often used to express a sense of boredom or indifference. It captures the feeling of being unimpressed or unenthusiastic about a situation, event, or conversation. People might say "O-Hum" when they find something uninteresting or when they are simply going through the motions without much excitement. This expression can be seen in various contexts, such as in literature or everyday conversations. It reflects a common human experience of feeling disengaged. Similar phrases include "meh" or "whatever," which also convey a lack of interest or enthusiasm.