Phrasal Verb: Cowboy up

This morning, I was watching ''White Collar'' and I saw a curious verb, It's ''cowboy up'' the sentence was

''Do I really gotta stay here''? Answer > Cowboy up! at least one time in your life, be a man!

Urban dictionary definition for it> '' Basically, another way of saying "Shut up and take it like a man" or "Quit your whining." The term is derived from the popular image of cowboys being tough, unflinching, uncomplaining, and hard-working.

"Cowboy up, man. What would John Wayne say if he heard you complaining over a little hard work?"

''You have to be a man! Cowboy Up!

I found it very interesting and I wanted to share it with you all.
That's all