This is a plural of LP aka
Let's Play. Therefore, LP's stands for Let's Plays. LP's are when someone records a video of themselves playing a
video game, then they upload it for others to watch and enjoy with them. The videos usually include
commentary from the LPer aka Let's Player. Some videos also include a small box which shows the player's face as they play, so the audience can view their reactions as they play through the game. You can find many LP's on YouTube.
Person A: Did you watch PewDiePie's LP's of
The Walking Dead? I
literally cried at the end.
Person B: No, but I saw the one he did for
Heavy Rain. It was an amazing game.
Person C: Do you guys watch any of Cry's LP's too? He just did a new LP of The Wolf Among Us. It was pretty boss. I can't wait until the next installment comes out.