The Brief: Zombieing is when someone with whom you have ceased all contact suddenly reaches out to you, usually online.

Bluesquiggle
DEEP DIVE

Ex-friends, lovers, and spouses may “come back from the dead” in a process nicknamed zombieing. A similarly spook-themed relationship term to ghosting, zombieing may occur after someone has been ghosted.

https://twitter.com/awkwardbachward/status/1054622795093528576