Verb: a prank/vengeful sexual act where a man ejaculates onto his partner's pillow while they are sleeping in hopes they will roll into it, only to wake with the pillow stuck to their face, resembling a marshmallow.
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.