This is Chesnut. He is a photogenic cat who has his own Instagram account. His human, ChazaySSB, posted these pics of Chestnut smiling for the camera on reddit last week, and they became an instant meme. See, it looks as if Chesnut is telling a joke that he thinks is uproariously funny. So everyone began putting words in his mouth. Here are a few examples- click to the right to see them.
There's always another bad Dad joke that Chesnut can tell. See 21 of them at Bored Panda.