Also found in: Acronyms.
1. A old horse, particularly one that is a poor racehorse. Bring that hayburner back to the stables—it's not even worth racing him.
2. slang Someone who smokes marijuana. I used to be a real hayburner in high school, but I stay away from pot these days.
1. n. a worthless racehorse; any old and worn-out horse. I went to a dude ranch, and they gave me an old hay burner to ride.
2. and hay head n. a marijuana smoker. (Drugs.) Some hay head was around trying to sell raffle tickets that looked handmade.