Definitions

Have you ever made out with someone?

Theoretically, if you're not super lame, you have. First you put your mouth on their mouth and then you mash your tongues together like flailing elephant seals and when you're done you fix your hair, walk out of the McDonald's walk-in freezer, and tell your friends about it.
When you do, what do you say?
"I totally just made out with this fine piece of ass, I think his name was Enrique or Solomon or some shit," and you high-five and move on.

Here is the key point: totally just MADE OUT with that fine piece of ass.
Sometimes, especially in my recent years, I have heard people say that they hooked up with that fine piece of ass.
Then I judge them because they boned in a walk-in freezer in a McDonald's. I voice these concerns because I'm pretty sure there are health codes about that kind of thing, and get reprimanded for assuming they boned when apparently they just kissed.

BUT YOU SAID YOU HOOKED UP.

When you hook up with someone, and when you say that you have hooked up with someone, it means you touched their wiener and saw them nakey and something has gone somewhere.
When all you do is make out, that's what you say. You don't say you hooked up because that makes me think something hilarious and inappropriate happened when all you did was kiss, and then I'm disappointed and confused. 

I guess for some people they think that making out is a subsection of hooking up and you can say the latter even if you only do the former. BUT you wouldn't say you made out when you actually had sex, because that's lying.

IT IS LYING, YOU ASSHOLES.

When you tell me that you hooked up but you only kissed it is lying, and that is rude and it ruins my life.

Example:
My friend says, "Did you hear that Alison hooked up with that guy Roland?"
I say, "REALLY? WHY WOULD SHE DO THAT?"
The friend says, "Yeah, they totally made out at the party on Friday."
I respond, confused, "Wait, did they hook up or just make out?"
"They made out," and I am given an annoyed look.
"YOU FUCKING DICK."
I was so excited because I thought Alison made a hilarious and terrible decision that I could laugh at her about, but it turns out she only made a moderately bad choice that is less funny to mock her about. So you see?

Saying that you hooked up builds my hopes and dreams and then you dash them on the rocks of prudeness when it turns out you just kissed.

Moral of the story: Use phrases right, goddammit