What is Heather[ing]?
1.
A term based on the 1980s movie, "Heathers" in which a group of people, usually popular, gangs up on another group or person (Unpopular) and bullies them.
I was walking to my car and Nicole and her click came up and "Heather" me to death.
"Look I'm sorry you don't like me, but please stop Heathering me, its so 1980s"