Can anyone retire abroad (outside the USA) and collect their SS out of the country? And what about the taxes?

There is no problem with retiring abroad. You will have to have a US bank as the SSA insists on direct deposit to a US bank.

As far as taxes, US citizens are taxed wherever they live, however, social security is not taxed by the US unless your other income is above a set limit which depends on your filing status. Your new country may tax you.

You can collect the monthly Social Security money (which everyone calls a social security check, but is actually paid by direct deposit, not check).

You cannot use medicare (the health insurance part of Social Security) outside the USA (except if you live in the USA very near the border, and have to cross the border for health care, because the nearest hospital in the USA is too far).

Yes you can. Plenty of people retire in other countries, either because it is cheaper or they have a lot of money and live better. You would pay tax if that income is taxable in the country of residence.

Best bet is to contact your local social security office or administration. There are a couple factors. Such as: will you give up your US citizenship in its entirety, what country you're moving to, whether it not they have a tax treaty with the US, etc.