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1.
A starcraft 2 veteran of many years who now plays stcarcraft 2. He's aboslutely hilarious and no matter what skill level you are at watching his dailies WILL improve your skill.
Dude! I just watched day 9's daily on drone timing! Now I ROFLSTOMP TEH NOOBEZZZZZ
by Day [9] fan December 30, 2010
 
2.
Day 9 is a Caster for a widely popular Vlog for the video game StarCraft II. He is by and large the sexiest male nerd alive. He teaches people to "Be a better gamer" and does so in a persuasive, funny, and encouraging manner. To call someone a Day9, is a great honor to both the caster, and recipient of the compliment.
Dude, that's so Day9 of you.
Let's practice, and you can be my Day9.

I wish my professor was a Day9.
by Oakstaff January 09, 2012
 
3.
Victory Day (9 May), Germany surrenders to Russia.

Also a popular Starcraft Player and commentator.
by Hegimon December 27, 2011