RMB stands for - Rolling my
brain. It’s taking rolling your eyes to the extreme. When someone says RMB they are so done with the subject/situation that their
brain is
literally cringing and rolling back.
Argh this creepy
guy won’t stop messaging me, RMB!
This chick won’t stop preaching to me, jeeze RMB.
You
like long walks on the beach? So boring, RMB.