What is 5151?
1.(verb) A person showing actions beyond that of a person who has a
2. (noun) A person of
When the officer put the 5150 in the back of his patrol unit, the subject suddenly went 5151 until he knocked himself out on the bars of the metal cage.
Jailor: "Take the 5151's straight to the infirmary. I hate having those noisy bastards in my jail. The 5150's mumble enough, thank you!"