“look like a lush”? What’s that mean?

What does it mean when someone says you “look like a lush”?
It’s in a song that I know by The Academy Is… and me and a friend are entering a contest where we make a fan-made music video, but I need to know what that word means!!! I need to know how I should act for the filming. If that maks sense. Here are the lyrics if it would help

It means you look like a drunk if someone says you look like a lush.

“How It’s Made – Banjos” Filmed at First Quality Music

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