Doing a Johnra on it means: Johra can be defined as: 1- Getting mad at your best friends over nothing; 2- Drinking so much that you can kill yourself once and never again, and then resorting to the 2 cans maximum policy. 3- Not using known units of measurement, e.g. A ‘fuck mile’ is a distance between 30 and 4.6 miles. (in Community Dictionary, added by Emiliano Montero)