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When you are not sick but call into work to take a sick day anyway because you want to spend the day having sex.
1: My boyfriend was off today but I had work, so I called in and took a much needed dickday.

2: To convince her to take a dickday off from work, I went down on her then handed her the phone.
by Urperf April 23, 2015
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2
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)
"Why's John being such a dick?"
"Must be his Dick Day."
by The Monster October 18, 2006
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