A person who thinks they can fix
something, usually on a car, better or faster than you. The keep running their mouth and getting in your way until you let them try to do the job. When they fuck it up, they get
mad and say "
Well if you don't want my help, you can do it yourself" then they leave.
It took me
twice as
long to change the struts on my car because Monkey Fuck had to
help, then he bailed out on me with all the parts scattered all over the garage.