Definitions by John W.W.

know knothing 

To know knothing is to misspell 'know nothing', so it means the same thing as to 'know nothing'.

It is rumored to have originated in a Twitter conversation by MiriIsACat in 2014.

Girl: "You know knothing"
Guy: "Know knothing, KNOTHING. NEVER FORGET. #KNOWKNOTHING2014"

know knothing by John W.W. March 30, 2014