Means: An idea or behavior that is passed from one individual to another by imitation or other non-genetic means.
In Internet culture: An image, video, piece of text, etc., that is copied and spread rapidly by Internet users, often with slight variations.
The modern meaning of the term 'Meme' was coined by Richard Dawkins, who referred to the non-genetic parts of the culture that are transferred between individuals. The term originated from the Greek word 'Mimeme' which means 'to imitate', and was modeled on the word 'Gene'.