Just watch the video, it’ll explain things better.
Somewhere in the world (potentially Cambodia, the poster of this video has one other video posted that is from Cambodia), a man on his motorcycle/moped/scooter wanted to take his cat with him on his next adventure, and since a car was out of the question, the cat had to find some way to be safe. So he’s clinging to the back of his owner, and he doesn’t look like he’s strapped in at all.
One thing is for sure: the cat isn’t wearing a helmet, which is probably illegal. But he’s clearly not a fan of the video being taken of him after all of the nasty glances he’s giving the man with the camera behind him.
Hopefully the cat arrived safely, and his owner doesn’t have claw marks in his shirt.