Noun: A person who is a total prick about being a perfectionist. One who cannot finish a task without checking it over again and again, or who does something repeatedly until s/he achieves the desired result. When this behavior annoys others, the person exhibiting the behavior is a "perfuctionist".
A: Oh, he's skipping lunch today, because he's being a "perfuctionist" again. He's rewriting his proposal to present to the Board of Directors this afternoon.