A series of events in which many people are consequently ditched. These series of "ditchings" all happen in an unintentional and unthinking manner. Hence, the ditching chain is completed.
You can only break the ditching chain by ditching the ditching chain by which you would have to unditch someone and go out with them.
"The plane ditched the girl, the girl ditched her boyfriend, in addition, the boyfriend ditched his friend at the bar, and, finally, the friend ditched the teacher at his tutoring classes."
"The tutoring teacher ditched the ditching chain by attending to her sister's birthday party and not ditching her."
When you make plans with someone to do something but then after you made the plans you cancel them and do something else with a different person. Some people think ditching is when you invite someone somewhere and they can't come but it's not.
Timmy: Oh man, I didn't do my homework because I have a life outside of school.
Bobby: Oh yeah me, too. Just ditch class and you'll be fine.
Timmy: Wait what's ditching class?
Bobby: Just skipping class and doing something more productive.