One's extended time of enjoying single life and not worrying about the stress of managing relations with a partner. These events can last anywhere from weeks to months.
"Hey Jimmy, noticed you've been single for a while. Do you want me to hook you up with this girl? She is clingy and looking to settle down with someone. Just your type!"
"Dan, I'm on a relationbernation. I would rather jump off a bridge than deal with all that stress. Lets hit the club instead."