Learn English – A word for the machine that tells a news reader what to say (using scrolling subtitles)

Dead on a target means facing or aiming precisely at that target, or precisely centered at that target.

ELU has a post about its etymology.

I don't believe we have a single English word for it. There is a term, but it isn't widely known.

It is called dimorphous expression, or "cute aggression" by psychologists and defined as "superficially aggressive behaviour caused by seeing something cute, such as a human baby or young animal". It is not real "aggression", but a primal feeling you want to squeeze them harder than you should, or perhaps bite them.

Wikipedia says of this behaviour:

"People experiencing cute aggression may grit their teeth, clench their fists, or feel the urge to pinch and squeeze something they consider cute, while not actually causing or intending to cause any harm."

I have never heard these terms used in everyday speech. If you were to use the term you would likely have to explain it. Most people would just express how they were feeling by description, perhaps using adjectives or superlatives.

A very commonly used expression is:

He/she is so cute I could just eat them up!