To have a really good time.
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To enjoy yourself enormously.
Having a blast is stronger than having a nice time — it suggests energy, laughing, and losing track of the hours.
It's casual and warm, so it fits friends and relaxed work settings rather than formal writing.
"Have a Ball"
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Also great fun, slightly older-sounding
"Let Your Hair Down"
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Relax and stop being careful
"Have a Blast"
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Enjoy yourself enormously