An utter disaster is when everything goes wrong at once, like your phone and computer both breaking down.
The word "utter" can sound scary because it has strong meanings, but most of the time, it's used to describe things that are extreme or complete. For example, if you're having an utter nightmare, it means it's a really bad dream from start to finish with no good parts at all. Utter chaos is when there's complete confusion and noise everywhere. You can also use "utter" with numbers, like saying your favorite TV show has had an utter five seasons, which means it's lasted for the entire five years without any gaps.
In some cases, "utter" is used to describe how people feel or talk about things. If you say someone's love is utter nonsense, you mean they don't think it makes sense at all. Or if a politician gives an utter denial of their past actions, that means they completely and strongly disagree with what others are saying.
On the other hand, "utter" can also be used to describe sounds or words themselves. If someone says the sound of thunder is just utter music, they mean it's beautiful and enjoyable to listen to.
To the furthest or most extreme extent; absolute, complete, total, unconditional.
Example: utter bliss utter darkness utter ruin
