run a train
The phrase "run a train" is a slang term with vulgar and explicit connotations, primarily used in sexual contexts.
Definition
C2Sexual Activity
(slang, vulgar)To engage in a group sexual act where multiple people have intercourse with one individual in sequence.
Similar
Terms that have similar or relatively close meanings to "run a train":
pull a trainmilk trainfreight trainrunning railchoo-choo trainrun inrun onrun torailway trainrun throughtrain trackon the railsrun byrun overrat runrun withtrain surfingroyal trainrun aboutrun the tablerun againsthog train