Remember the video game Street Fighter? It's having a comeback with a new meme. Based on an attack move from the game, "hadouken-ing" basically consists of one person striking either a pushing pose or punching the ground while others seemingly fly away around them. If the '90s are a haze for you, this is the original hadouken from Street Fighter:
Like "Street Fighter" itself, the current hadouken trend seems to have originated in Japan, and some predict it will be the next Tebowing. You can be an early adopter! Make sure you do before it goes stale.