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A groom's outing with his male friends before his wedding; a bachelor party. Mark knew that his stag party had gotten out of control when the police arrived.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
A social gathering for men exclusively, often involving entertainment considered unsuitable for women. For example, They wanted to give him a stag party before the wedding but John wasn't interested. This idiom uses stag in the sense of "a man unaccompanied by a woman." [c. 1850]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n. a party for men only. (Thought to be raunchy.) They hired a stripper for the stag-party—you know, the kind that jumps out of a cake.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.