OA
short for Over Archiver. One who goes above and beyond for no reason, except to be that one little bit better than you and all your friends. Generally disliked for breaking curves, and just doing better, Though they claim its merely jealousy on your part, everyone else knows theyre obnoxious. Can be ended in 'd to mean Over Achived.
Man, Jane is such an OA, I hate it

I totally OA'd that homework assignment, you shouldve seen how mad all the slackers got.
by Brian J H March 26, 2007
OA
OverAll. Can be used to describe a measurement; length, width, and height overall.
It measures 7" x 6" x 6 1/2" OA.
by Evilyn January 27, 2006
oa
object of avoidence, namely some creepy gross person who likes you
stephan is the new oa..hes totally following sarah everywhere
by couch March 01, 2005
OA
The order of the arrow, An Honor society in the Boy Scouts of America.
Hey, are you in the OA?
by He'sTheMan March 16, 2005

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