What does "make yourself at home" and "take what you like from the fridge" mean?

Posted by wheninrome5000@reddit | AskAnAmerican | View on Reddit | 342 comments

Some Americans when hosting take a very open generous approach saying "make yourself at home" and "help yourself to anything in the fridge"

That is sort of an unfamiliar concept to me -- more used to having things set out.

  1. As for the Fridge: does it just mean "take a can of coke," or is it meant to license prowling around for snacks (say, making yourself a sandwich?) What about alcohol?

  2. what are the implied limits on "make yourself at home?" Can you turn on the TV, for example? Play video games?

I admire the spirit of generousity and hospitality that this conveys. But what are the unspoken limits here and how to avoid breaking them?