Our sources say the friction surfaced after Meek tried pressuring Nicki to stay close when he goes into lockdown for 90 days for violating his probation on drug and gun charges. We're told Meek wanted Nicki to live with him in Philly during his house arrest.
We're told Nicki blanched at the notion, saying she would not put her life on hold because of his criminal issues, and that triggered a big fight that is still unresolved.
Nicki's been in L.A. this week ... and it's unclear when she's going back to Philly.
Our sources say Nicki and Meek fight a lot, but this one's bigger than the others.