A person who suffers from any mental disorder such as down syndrome, who continually bops there fucking head as if they feel that it is 100% necassary for the continuation of there lives.
Frank: Is that kid rocking out?
Bill: nah its a fucking headbopper
A female or male who is constantly commenting on everyone's Facebook statuses. They are constantly messaging guys or girls who are friends with each other trying to talk to them.
Say son, look what oh girl just messaged me.
"Man, she sent me the same thing, smh...friendly boppers."