Is that a real word?

I thought this chapter was extremely interesting, especially the section about approving or not approving new words to go into the dictionary. There is a ridiculous amount of slang used in our everyday lives and I know I am one of those people who use it, but just because we use it does it make it a real word? I am a little torn on this subject. I think that if it becomes common place then people should probably accept it as a real word. Should it be used in a very important paper that you are writing for an english class.... probably not. I think there is a fine line between what people can say and get away with and what people can write and get away with. I thought I would share a funny website that has just about every "word" you can think of and some that you never thought you would. www.urbandictionary.com

Just to show you a few examples from the site...

First World Injury-

An injury mostly likely to occur in an advanced first world country due to the high standard of living.

Karma suffered a first world injury walking into a dumpster while tweeting on her smart phone.

Longversation-

The quality of a conversation that is both long and rambling, without a fixed purpose and lacking in concision. Generally used in a negative sense.

The other day, Julia and I had such a longversation. I thought I could never leave!

And the list goes on and on, you should go check it out.

CORRECT USAGE

Correct Usage vs. Jargon

I found this part of chapter 7 to be very interesting. I would have never thought that certain words were jargon and others were considered correct usage, like using prioritize instead of a more simple word like rank. Using bottom line is considered correct because it is taken from a universal term and means only one thing. 

I feel like I use a similar type of word when I say shoot instead of photograph. I think that because it makes us (or at least me) imagine looking through a lens or scope to line up whatever it is that I am going to shoot. I think in this case it is ok to use this term. I can understand how certain words can be taken out of context. If I am not carrying my camera around it might not be as easy to understand and I should use photograph instead of shoot. So is this jargon or correct usage? What do you think?