To get up the courage to do something U R scared to do.

To overcome your fear, to act despite your fright and show some confidence by being a man.

A descriptive term for having intercourse with a lady; supposedly because of bodily fluids.

The phrase "to get your balls out" means to pluck up the courage to do something. This can be anything, from riding a ferris wheel, to jumping off a tall building.
It is based on the theory every one has the courage or "balls" to do something, it is just a case of "getting them out"

The phrase get your balls wet is intended to indicate that one must go balls deep or balls out giving one's activity 100% effort

Get big... grow a pair... saying this to someone means to toughen up and do it

What is said to a guy who allows his pride to be taken from him chronically, often by a woman

Said to a wimp to encourage him to regain his dignity.