Contrary to what some may believe, to pull an 'Espen' actually means achieving something larger than life, a supremeachievement few could only dream of.
That's one small step for an Espen, but a giant step for mankind, all of whom can only dream to be as great as him.
An Espen is someone who can't complete the most simple of tasks without looking like a total fuckup. They also might be someone who has an opinion on everything although they have know prior knowledge to the topic. Another reason for calling someone an "Espen" is that they will always do half a job.