An expression when someone is being a dick for no reason. It is in reference to October 17th which is National Dick Day, the one day a year you can be a jag-off to whoever you want and no one can hold it against you.
Dick Day is also a Senator from Minnesota (www.dickday.org)
A special occasion where you are permitted to suck Syan’s extremely large cock and will experience a large amount of sperm entering your mouth. You cannot argue against this, everyday is Suck Syan’s Dick day.