What does 'He who laughs last laughs longest' mean?

A person may feel satisfied or pleased when they d something bad or unfair  to you, but if you can get revenge, you will feel more satisfaction.
('He who laughs last laughs best' is also used, and 'he' is sometimes omitted.)

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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