In the past,
nose rings were a method of controlling bulls because they were dangerous to the handlers. As time went on, it became customary to only use
nose rings on bulls led by a halter.
Nose rings are unnecessary for bulls that are not led. Getting "bullnosed" means your superiors believe you are too smart for their own good, so they distract you away from a deal, group, project or company.
I got bullnosed on that deal by my
big-timing bosses because I can do their
job and everything they can't do on the computer because I have actual
skills.