gentlemen, mentlegen
Gentlemen is a form of meme from a game called Team Fortress 2 (TF2). The whole idea came from a character in the game known as the spy. The spy is always smoking a cigarette even if he is masked. The saying comes from what the spy says at times. He utters the word, "Gentlemen" and sticks a cigarette in his mouth. As you can tell from the pictures above there are many many different styles of this meme. Most include characters from games.