This is a slang use for something very good or strong. People say 'killer' about things that impress or work very well.
That movie was a killer hit last year.
She told a killer joke at the party.
This meaning refers to natural living things that cause death or harm. It can be used in nature or science.
The spider is a killer in its home.
Some plants are killer in the wild.
Used to describe things or situations that are very hard or cause pain. People use it to show strong difficulty or effect.
That exam was killer for many students.
He has a killer headache today.
This meaning uses 'killer' for something that stops or destroys other things completely. It is often used for natural or general situations.
The storm was a killer of the old trees.
Heat can be a killer of ice.
Sometimes 'killer' is used for things like tools, weapons, or devices that strongly defeat something else. This is common in games or informal talk.
He used his killer to win the game.
The new phone is a killer in speed.
This meaning describes a person or thing that causes strong positive feelings or attention. It is often informal or slang.
She is a killer on the dance floor.
That song is a killer that makes people happy.
