a crazy asses idiot who does stupid things on a regular basis. They never learn. Are almost certain to do the SAME idiotic thing at loest 78 times.
Person 1: WTF! That CRAZY MOFO has broken my garden fence 78 fucking times!!
Person 2: Yeah well, what do you expect?
short for crazy mother fucker. Most annoying phrase in the universe.
" you're one crazy mofo "