"Milk in the basement" is a saying used when a complicated situation has been resolved.
Ingrid: "Did you end up resolving your issues with her? Or is there still beef between ya'll?"
Lindsey: "We talked about it yesterday. It's all milk in the basement at this point".
Ingrid: "Nice"
A phrase to describe a situation being over with/ ok. A dispute, argument, or bad situation has been amended.
"Are you guys still arguing?"
"Nah man, it's milk in the basement at this point"