
Eff off
Informality
The phrase is very informal and can sound offensive, better used among close friends.

We were joking around and I told my best friend to eff off when he teased me.
Intensity
It expresses a strong desire for someone to go away, carrying more force than simply 'leave'.

She was so irritated with the salesman that she snapped and said 'eff off!'
Anger Expression
It's often used to show anger or frustration towards the person being spoken to.

After losing his patience, he shouted at the noisy neighbor to eff off.
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