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1.
Going somewhere, especially a crowded event solo.
Jeff: Kayeman, who you taking to the party?

Kayeman: I'm going stag .
by Kayeman Lanes March 19, 2006
 
2.
Going single to a big event, like a dance, party, wedding, etc.
No one asked me to the prom, so I guess I'll be going stag.
by Cj123456789 April 07, 2012