the men at a social gathering who are not accompanied by a date or dancing partner.
Origin of stag line
An Americanism dating back to 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for stag line
The first wedded kiss, and the stag-line demanding its similar perquisite.The Great Potlatch Riots|Allen Kim Lang