1997 April 6, emesone [username], “re:somebody needs an education”, in rec.audio.opinion[1] (Usenet):
Don't they see the oxymoronicness of bitching on and on and on how they care not about what I post?
1998, Harry Levy, Chain of Custody, Fawcett Crest, published 1999, →ISBN, page 163:
All I remember saying is, "My pleasure," and being struck by its oxymoronicness.
2001, Steve White, Family Vacations & Other Hazards of Growing Up, Chloe Press, →ISBN, page 19:
The oxymoronicness (deluded writers are allowed to make up stupid words) of vacation with your family is also affected by Variable 2: Your own Personal Irritation Factor.