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.
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.