A play off Rock Bottom
When you are as bored as you can possibly be. Nothing you have available to you looks interesting. No matter what fun activities you indulge in, you remain bored.
Guy: Man, I'm bored
Friend: Oh, wanna play some video games?
Guy: No man, I've hit rock boredom
The level of boredom that is so extreme, you begin doing things that are entirely shameful and embarrassing. Sounds the same as "Rock bottom" in a Jersey accent, anyway.
You've officially hit rock boredom, buddy.