A jerk is a noun, which refers to someone who is rude, thoughtless, etc. To jerk off which is a noun phrase, refers to a male masturbating. However, a jerkoff could also refer to a person who you think is an idiot.
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At some point in your work life, you've probably had to interact with a jerk. They're the people who demean and disrespect you. They might steal credit for your successes, blame you for their failures, invade your privacy or break their promises, or bad-mouth you, scream at you and belittle you.
There's no law against being a jerk: Check out this new court ruling. There's a big difference between mistreating an employee and mistreating an employee for a reason that the law prohibits. In other words, there's no law against just being a jerk.