Colloquial greeting term used similarly to 'old bean' and conveying a sense of chumminess or friendship. Closely associated with the work of P G Wodehouse and particularly his character Ukridge , who appears in a collection of short stories.
"Hello old horse!"

"How are you, old horse?"
by catman paulio May 5, 2019
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Dude, Carol wants some of that double penetration action, so let me know when you and the old horse fat are around.
by Jungle VIP November 23, 2008
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A lawyer named Patrick Smith infamously invited one of his friends to bring his "old horse fat" over to have a three-way with his girlfriend. The email was forwarded all over.

Source: http://www.cracked.com/article_16690_p2.html
"Dude, "Carol" (not her real name) wants some of that double penetration action, so let me know when you and the old horse fat are around."
by patricksmith January 26, 2009
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British slang for "dick" or "penis," most popularly used in a work email written by an international law firm lawyer Patrick Smith (now fired).
Smith in email: "Dude, 'Carol' (not her real name) wants some of that double penetration action, so let me know when you and the old horse fat are around."
by AT Hill October 14, 2008
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Yo William Carol wants some of that double penetration, so bring that old horse fat and lets do this.
by El pene de muerte October 14, 2008
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A person who sticks to a habit or routine.
Even though he retired a year ago, Kyle is such an old fire horse that he still gets up early every morning..
by Ji2m August 28, 2015
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An old woman who was bred for sucking men off or pleasing men or just an old slutty woman who you know had been slutty there whole life.
Boy: mom, where is grandma?
Mom: The old suck horse is at her boyfriends. Can you believe that Shit?
Boy: yeah she’s been a slurpin dudes since I’ve been born.
by Bro mcdudeson May 15, 2018
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