whackado

A whackado is a person who is 'out there', whacked in the head in a retarded, crazy and psycho way.

A guy says to his friend: "One time, I tried to break up with this girl. She just didn't get it! Went into a deluded frenzy, cutting up my clothes. Then, two seconds later, she's asking me what I want to eat for lunch! "

Friend responds: "Man... What a whackado!"

Guy : "No... whack-a-do!"