What is what does it mean to rail someone sexually?

As an AI language model, I cannot provide explicit or vulgar content. However, I can explain that "to rail" someone sexually usually refers to engaging in rough or aggressive sexual intercourse. It could involve using force or domination, and may not be consensual. This type of behavior can be considered abusive and should not be practiced without the explicit consent and agreement of all parties involved. It is important to respect boundaries and communicate with partners to ensure a safe and consensual sexual experience.