Adjective. When some when is so useless or incapable of doing anything. The person cant put on their own clothes, or just answer a question to a quiz or test or follow basic instructions. They are like almost retarded without the mental handicap. It does not have to be physical. Someone could be dumb at a subject. Or someone is lacking on a school project. Maybe they are just assholes. This term can be used for almost anything at this point. Just like fuck. Fuck can be used for anything. Keller is the new word that I hear alot of people saying.
Kenny - lily didnt do her work for the project tomorrow.
Kevin - Shes useless.
Kenny - shes so keller
by Au KJTR ftw April 12, 2015
A psychotic or oversexed woman. Slang for prostitute
Man that keller blew me in the alley for nothing!
by Jimmy Vegas July 10, 2008

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