When multiple boys have sex with one girl at one time
They ran a train on her last night
John: hey Joe what are you doing later?
Joe: I'm training later.
a train is a machine with an engine
a train is usually used to transport people from once place to another. this is a traditional definition
If you are a train, you are automatically a banana. You are a capitalist. You will die. Immediately. Or maybe not. Point is, being a train is the worst insult ever.
Person 1: Isn’t Trump just the greatest? He’s made our economy amazing?
Person 2: You are such a fucking train, Jerry.
Person 1: What you liberal SJW snowflake spy?
A group of males and one female involving sexual activity and ejaculating inside of the female
CANT STOP THE A-TRAIN BABY!