The 'When You Nut In Space, It Push You Backwards' meme is a viral internet phenomenon based on a humorous application of Newton’s Third Law of Motion. Originating from a 2017 tweet, the phrase suggests that due to the lack of gravity and atmospheric resistance, the act of ejaculation would theoretically act as a form of biological propulsion. The meme gained massive traction on platforms like Tumblr, Reddit, and Twitter, often paired with reaction images of people looking enlightened or deeply disturbed. It serves as a classic example of 'absurd science' humor, where rigorous physical principles are applied to crude or mundane human experiences to create a jarringly funny realization.