A person who, at the
peak of a tough situation, offers an idea that couldn't possibly
ever help anyone in anyway. This idea could also cause more problems and create a worse situation.
In the office the printer has caught
fire. John comes over and says "Why
don't we all throw
paper on it to put it out?"
John would be considered a nonsensical jockey in this situatuon because his idea couldn't possibly help and may make matters worse.