Sneako was minding his business, streaming and walking down a New York City sidewalk when all of a sudden he got sneak attacked … a man sucker punched him in the face and took him to the ground … and it’s all on video.

The famous streamer was looking down at his phone when he walked by a man who appeared to be waiting for him … the aggressor unleashed a right hook that hit Sneako in the face, and then he took Sneako to the pavement.

Following the sucker punch, the camera goes to the ground too … and it sounds like a struggle ensued … plus, there are lots of expletives.