Recently, in a magazine, I read the following line:
It's been an eventful year and boy, has it flown past!
My question is, what does the word "boy" mean here? Is it an idiom? What is its usage?
You hear it pretty frequently in the "Oh Boy!" which used earnestly usually indicates excitement about something (or when used sarcastically, expresses dread).
A less common usage is "man."
"Man, this is great."
It is a way of addressing no one in particular.