what does this phrase "take a slug" mean? Thank you.
what does this phrase "take a slug" mean? Thank you.

Question

Answer

There are different meanings. We need context. Here are some possible ones

Take a bullet / get shot
Take a shot of whiskey
Take a punch

Answer

It's an American expression that means to punch someone. 
E.g.  
He took a slug at me.
Take a slug at him.
He slugged me.

:)

Answer

It really all depends on the context... The above answers are correct.  There are other meanings of "slug".

https://www.merriam-webster.com/dictionary/slug