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1.
Someone who persists at an activity, like sport, despite hardship and age, maybe when they should have retired or given up a long time ago.
Dean McDonald is such a warhorse on the footy field. He's always injured and broken down but does his best to get back into the game.
by redback3 March 28, 2011
 
2.
A term referring to an old, retired military man.
"I'm not a colonel anymore...I'm just a retired ol' warhorse."
-Colonel Campbell, MGS
by Dave April 01, 2004
 
3.
Very bulky male. Not over weight just very muscular and tall. Walks with determination and pride. Their very presence demands respect. Looks very majestic when walking by.
Wow, did you just see that war horse go by?
by AlwaysVillainous February 17, 2012
 
4.
Typically bartenders married to the bar's owner and older divorced women, war horses are a special breed. They have years of experience under their belt and are always looking for more. You can recognize them by their cock-trodden faces. They still have a hot body but beware of surgery, c-sections, old boyfriend's name tattoos, and huge meat drapes
"Yo I think that war horse would definitely eat your asshole"
by Mr. FF January 08, 2007