Def. 1 (verb) To attempt the same challenging action after failure. Apparently derived from an old adage: "You have to get back on the horse that threw you."

Def. 2 (verb) To get back into a habit. Traditionally this would refer to a good habit, but sarcastically might refer to a bad habit or addiction. Possible confusion with the phrase "on the sauce".
Def. 1 - I know you burned the turkey trying to cook Thanksgiving dinner, but you can't let that stop you if you really want to become a chef. You'll just have to get back on the horse and try cooking it again.

Def. 2 - I'd been trying to do 30 minutes of exercise every day, but my work schedule eventually got so busy I could never make it to the gym. Things have calmed down quite a bit recently though and I keep meaning to get back on the horse and go work out again.
by Peter K. November 28, 2007
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To tell somebody else to "take back YOUR fuckin horse" means for that person to take back a problem they have cast upon you, without your willing consent.

When you throw or cast YOUR problem(s) onto somebody else, just to get that trash away, it will come back. The "Horse" is the problem, it can be anything that is causing issues for you, and you dont want anymore.

So to truely take back the horse, means the other person you cast it on, is fed up with having that shit on them, and they feel its time for you to deal with the problem, not just give to others.
Frank thinks: "Im fuckin tired of Betty always hitting on me, why wont that ulgy slut leave me alone!"
____The next Day___

Fred: "Hey Betty, i felt it was time for me to finnaly treat you right, so im gona hook you up with the coolest guy i know. trust me, he fucks like a tiger. His name is Tom."

Betty: "O hell ya, i havnt got laid in weeks, thanks ^_^"
::::::::Next day:::::::
Betty: "Hey tom, wanna fool around, im so horny right now"

Tom thinks: "Damnit Frank, i dont want this slut on me now -"TAKE BACK YOUR FUCKIN HORSE"-
by Elmo88 March 24, 2009
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