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For those who go on a holiday/vacation before their wedding to celebrate their engagement or just because they can!

Butter is spread on a crumpet before honey. Therefore it is a Buttermoon, not a Honeymoon!
"Steve and Sarah went on their Buttermoon in the Greek Islands for two weeks before their big day."

Newly engaged lady - "Let's go to Bali and relax before the wedding"
Fiance - "Yeah, let's go on our Buttermoon."
by kylid April 08, 2014
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