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1.
Used when to describe something you are referring to without actually letting the adjective you want to use be known. Means simply, a good thing or a bad thing. Used in many ways. It takes skill.
"Dude, did you see that chicks hair? NOT OPTIMAL." or
"OMG, did you see that hot guy just walk by? OPTIMAL."

1) someone just stepped in dog shit. NOT OPTIMAL
2) i just found the perfect dress. OPTIMAL
Por nadaaaaa 10 de enero de 2008
 
2.
An exceptionally bad player in a FPS computer game. Usually used to criticize the lack of teamplay of said person.
"You blinded all your teammates, you optimal!"
Por Orion 06 de noviembre de 2004