The Brief: The exploding head emoji means "mind blown," indicating shock, awe, and/or surprise.

DEEP DIVE
The exploding head emoji means “mind blown,” indicating shock, awe, and/or surprise.
Im in Denver and I thought city wok was fake and only in South Park π€―
— πππ―π’π₯ ππ¨π₯ππ² (@Coldh4rt) July 19, 2018
The DOUBLE Fortnite flip!? π€― (via Kavon Mario) pic.twitter.com/LBFL2rcL33
— Overtime (@overtime) July 18, 2018