the problems/issues that are left over from a terminated relationship or friendship that are left open-ended or continue to disrupt your life in some way that keeps you tied to an individual who you wish to sever ties with.
Basically, leftover drama that continues to bug you.
Brian still tries to talk to me about his residual bullshit with Helen. He needs to man up and accept the fact everything was his fault.
Finding out a friend said a bunch of stuff behind your back after you two were not cool anymore.
Dealing with the affects of decisions made by you and an ex together that mess up the rotation of your life after the relationship ended.