What is the meaning of the word "dick"?

Definitions:

a term for a penis, occasionally used in a sexual context noun
- I am very proud of my dick.
an unpleasant person, often meant as an insult, but usable in some public contexts noun
- You're a real dick sometimes, you know that?
someone who is a detective noun
- I hired a dick to chase down that employee that stole money from us.
to have insertive sex with a partner verb
- I dicked my partner real good!