A girl who you've been dating for at least 3 years and with whom you currently live. She's someone you intend to marry, and someone you view as more than just a girlfriend, but who is still not legally bound to you. The wifey is becoming more common as people are more deliberative about entering into marriage. A lot of people in the current generation are either waiting until they are financially in better shape to get married or are putting it off to work out problems before they walk down the aisle.
"You've been dating Kerri for 5 years. When is she going to become your wife?"
"She's my wifey, and I love her so much, but she won't become my wife until I can figure out my cheating problem.
When a female is usually a slew but starts to act straight and loyal as soon as she gets into a relationship or starts talking to a guy. She acts wife-like.