"Fresh popcorn" refers to popcorn that has been recently made or cooked. It implies that the popcorn is still warm, crispy, and has a delightful aroma and taste. Full definition
On top are ironstone mugs filled with «cocoa» and marshmallows, a gingerbread man with raisin eyes, and a vintage lunch bucket filled with fresh popcorn for a sweet treat by the fire. (sugarpiefarmhouse.com)