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1.
Agree with, show support. Usually used on forums, such as WoW and preceeded with / to represent in-game emotes.

Comes from the signing of petitions to support an change or idea.
Necronomicon: Nerf Gattsu!

Taux: /signed.
Sixyp: /signed!
by SilvermoonLanguageDirectory December 05, 2005
 
2.
-A word proceeding your name at the end of a written work, such as a letter to someone.

-A way of expressing agreement or approval of something, used much like word, hell yeah or I concur.
Leo, Andy's been raiding the fridge again.
P.S. You're da man.

Signed,
-Ruben


"Man, guys! Paula's SO HOT!"
"Signed!"
"Word."
"Hell Yeah!"
by H Hog January 12, 2005