back issue 

1) old news

2) something or someone that had its time, but has since faded from the scene.

1) "yeah she told me they broke up, but thats already back issue since it happened 3 weeks ago."

2) "The White Stripes? nah man, they're back issue now. Stereogram's where its at now."

back issue by kingman June 3, 2004

Back Issue Bias 

The belief that a magazine's back issues are inherently less worthy than the current issue

Magazine shops with Back Issue Bias destroy old magazines or charge publishers to return them.

Back Issue Bias by hamam&co June 12, 2022

Back Issues 

What happens when you try to give yourself a BJ.

"My back hurts..."

"Why?"
"Because I tried to suck myself and now I have back issues."

Back Issues by Syd27 June 8, 2019