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This is when a cat walks really fast and smoothly like a train, with their tail raised at a ninety degree angle from their body. This act is usually used by the cat to greet someone by head butting them. It is also accompanied by a welcoming, growling meow.
Brandi: "Dihna! Will you stop felis trainacussing!"
Sydney: "Awww, your cat is so cute!"
by MeowDihna November 14, 2011
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