bachelor party
noun
Definition of bachelor party
: a party for a man who is about to be married usually attended by men only The plot is perfect. It's got three groomsmen taking a groom to Vegas for a bachelor party, only the next morning the three groomsmen can't remember a single thing that happened, that's how blotto they got. — Erik Hedegaard
From the M-W Editors
1922
First Known Use of bachelor party
1922
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