A Southerner, especially one from Georgia or South Carolina. A reference the the Civil War "March to the Sea" when Sherman's army burnt down cities and towns along the route of march.
She's a Sherman's Marshmallow ,seeing as she's from Atlanta.

Sherman's marshmallows sure get pissed when they are reminded of the Civil War.
by Uncle Thor June 27, 2018
Get the Sherman's Marshmallow mug.