a cultural feature or a type of behaviour that is passed from one generation to another, without the influence of genes

A meme is the cultural equivalent of the unit of physical heredity, the gene. 文化中的模因相当于遗传中的基因。

an idea, image, video, etc. that is spread very quickly on the internet

Take a look at the top ten internet memes for this past year. 看一下去年互联网上的十大模因。