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3.
Used to state an achievement or compliment someone on an achievement. Commonly used in Halo LAN parties, especially those in the Emmaus, PA area.
"Haha I just stuck you. 10 Points for Gryffindor!"

Guy: "Dude I just got a triple kill!"
Rest of Team: "10 Points for Gryffindor!"
by BJ69PA December 28, 2005
 
1.
a phrase used to communicate that you just had sex
I finally had sex with my last girlfriend. After we finally did it for the first time, I reached across her, grabbed my cell, and text my friend "10 points for Gryffindor!"
by thatbk423 April 15, 2010
 
2.
May be said in response to any successful or favorable action.
10 points for Gryffindor!
by DracoBlue June 30, 2010