Thesaurus Rape 

When someone uses big words despite the fact that they:
-Cannot spell
-Sound unnatural saying them
-Don't know what the words mean
-Didn't need to use such complicated words to get their point across
-Are really dumb, and try to sound smart by saying them

Tom: I have just explicated your histrionics you boondoggling pantimime!
Jake: And you are also guilty of thesaurus rape....

Thesaurus Rape by Brahma February 3, 2007

thesaurus rape 

The use of "big" words in lieu of their "common" counterparts (often out of context) in a futile attempt to sound more intelligent. This technique is often used by liberal arts students when attempting to sound competent when talking about a subject that they have no clue about.

In a class room discussion about UrbanDictionary.com

Jill: Urban Dictionary's abominable nature not only proliferates the use of exiguous, diminutive, colloquial English, it actually bolsters and espouses it!

Jack: ya, and it gives us words like thesaurus rape to describe what you are doing!!

thesaurus rape by dmangest August 17, 2009