Abbreviation for Rip Me A New One - R.M.A.N.O. - a verb / action - used sarcastically.
A non-medical process, in which the person explaining is intensely concerned about having their anus expanded significantly, or perhaps, have a new aanus created where there was not one previously.
Pronounced "Are Man-oh"
"Why don't you just RMANO ?" or "gawd, he just RMANO" or "i was gonna tell her we might be late dog, but I was afraid she would RMANO"