What is Yard Bull?
1.
A railroad police officer. Often just referred to as a "Bull" by tramps, hobos, and graffiti artists. Their job is to secure rail yards and prevent theft from or damage to railroad property.
When riding the rails, you have to look out for the local Yard Bull.
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1.
To engage in sexual intercourse. The phrase is usually used when a friend has waited a period of time for you to exit the room in which ..