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1.
Basketball Slang: Good Defence

Quite often yelled from the sidelines by Coaches or other players
"Good D Mikey, Good D!"
by Nathan Fenn June 15, 2007
 
2.
Applause, on congrats for getting a good mate
Oh you with Sasha now "Good DDDDD!!!!!"
by jjuice August 29, 2008