We gotta recognize that this word gaining traction is coming from the ugliest part of the Internet. So, no, "having" a girlfriend isn't impressive. She's using your beta-ass for your money and getting hers on the side. You're too weak a simp to get yours.
Yeah...just google "cuckold" and then look at the way a lot of people use it in reference to damned near anything. It's usually meant to be racist... ...especially when talking about Star Wars.
"Cuck" is basically a way to call someone a faggot. It is popular on 4chan and the far-right blogosphere. We are not interested in giving it a space here.