What does “score” mean in “scored a keg”?

In this scene from the film i’m watching, the dad says to his daughter who’s planning on going to a party,
“I know what this party is about.
The parents are out of town, right?
Somebody’s **scored a keg**,
You guys are gonna have a good time trash the whole house.”

Now what does “score a keg”, especially the verb “score” mean here exactly? Is this phrase used as some kind of an idiom?

Thanks a lot in advance!

Question

What does “score” mean in “scored a keg”?

In this scene from the film i’m watching, the dad says to his daughter who’s planning on going to a party,
“I know what this party is about.
The parents are out of town, right?
Somebody’s **scored a keg**, 
You guys are gonna have a good time trash the whole house.”

Now what does “score a keg”, especially the verb “score” mean here exactly? Is this phrase used as some kind of an idiom?

Thanks a lot in advance!

Answer

Score just means to acquire, to get. It's got a positive connotation. It also implies a little bit of good fortune, or luck in something that would otherwise be kind of hard.

I scored tickets to the concert.
I scored a job interview at Google. 
I scored a keg (they're underage, can't legally buy alcohol, so it's kind of hard to do so)

Hope this helps!