A Dickstamp is just a common insult coined by Jonathan S. that is thrown into the group of insults such as Shitstain, Asswipe, etc... It is basically just a nonsense word that sounds offensive, and used alot while driving, and you are un-happy with surrounding drivers.
The smooth long shaft of a penis. Usually to be inserted into a moist vagina. Used to describe an irritating and profoundly annoying person. Synonyms include: Dickass, Dickrod, Dickbama.
"Mark is a dickstem, he raped my husband yesterday!"
"I love how a dickstem feels in my head."
"Oh Ron! I love your dickstem in my ass" -Hermione
We just got revisions back from the client and they have a ton of changes. Every assholeover there has to put his dickstamp on every goddamn thing we do.