oxymoron

Words which loose their meaning through self or mutual negation. Usually in a comical or amusing way. The most unique of the Oxymoron 'words' are the single or paired word oxymorons which attempt to describe a larger subject without actually negating each other but in fact are a 'double negation' of sorts. For these you need only know the actual definition(s) of the root word(s) (as provided by socially legitimized sources of knowledge - I.E., Webster's or Funk and Wagonal's) in its intended use in juxtposition to its actual use in situ.