It's a neologism for multimedia content that produces some kind of addiction, such as social media catching its users, who feel they can't stop checking them. A more specific case is the providers of videos, images or news, which are specially designed to capture attention and that users do not leave their platforms. It is formed by the prefix info- (for "information") and dopamine, a neurotransmitter hormone that is popularly more associated with sensations in the reward state, the pleasure you feel when getting something.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
