Checked out means you borrowed items after recording them, left a hotel after paying, or took a look. Informally, it can mean mentally disengaged or, in dark humor or slang, died. Context makes the meaning clear.
I know when I walk into that classroom in the morning, even if it's for a split second, at some point I'm being checked out. Kate Winslet
It's too hard a life for me. I could only do it - check out in that sense - if I checked out somewhere that was luxurious and within hailing distance of civilization. Derek Jacobi
God bless Interlibrary Loan. I pay a lot of library fines. In the case of 'A Single Shard,' I was using books that hadn't been checked out in 30 years, so I didn't feel too bad. Linda Sue Park
I was so naive about writing, I went to the public library and checked out the only volume they had on the topic - an academic treatise about publishing from the WWII era. Bruce Feiler
I checked out all types of tobacco trying to find one that would be easiest to live with, I ended up using pipe tobacco. It burned slower, and it wasn't as harsh on my throat... It also smelled better. David Strathairn
I want to encourage everyone to be proactive with their health and get checked out. Giuliana Rancic