To have an excuse to not be "dating"....yet still routinely boning. A way to subtly deflect impertinentquestions with sarcastic humor via archaic terminology without offending the one with whom one bones.
"Dude, I saw you withthat girl last weekend. What's up withthat?"
"What are you talking about?"
"Are you dating?"
"Nah, we're just courting."