One who studies blondes, their behaviour, as well as their social and economical impact.
Person 1: I don't know what i want to be when i grow up...
Person 2: Be a blondologist!
Person 1: Hey, that would be fun! I don't know if I'm qualified though...
That person in your friend group designated for complaining to about everyone's problems with their boo or booho. Basically, it's a low-budget relationship counselor.
Monique is my best friend and booologist, I'm always talking to her when I have a problem with Tyler.