To obsess over an ex girlfriend, to the point of sending her mother a letter.
In the realm of cyber space, there was once a hunk of a man, who did not posses a bright red nose, a shocking face or eyebrows which looked like they had their own type of follicle down syndrome - who was left by his "fat, thunder thighed, whore of a girlfriend" for a "balding, old, overweight German paedophile" thus sending him spiralling down into a word of despair, sadness and anger. However, credit to be given to this man, he did not turn emo. Oh no, he sent his ex's mother a letter. He sure showed them.
To over react in such a pathetic and bordering on compulsive, obsessive and plain old pathetic manner, is doing a Pieman.
An incredibly large person, known for his love of fast food, especially the pies for sale at half time at a football (soccer) match. Tends to take up more than one seat, and obscures the view when you're trying to watch the match.