N. Describes the fairly common occurrence amongst literate types, in which two synonymous or near-synonymous words are spoken somewhat atop each other, resulting in the creation of such phrases as "dramastic", "grood," and "for suretain." While these phrases have been used intentionally, true thesauric collisions only result from accidentalconstruction of such phrases.
While Leeroy was at the cocktail party, he accidentally subjected the words "sweet" and "nice" to a thesauric collision, and thus told the Swedish ambassador to the UN that his expensive new martini glass was "swice."
To completely ruin an essay by referring to a thesaurus for every other word, thus inserting words that you don't really understandthe definition of to make yourself appear smarter to the reader.
When a person decides to improve his/her writing (essays, poetry, etc.) by looking up synonyms in a thesaurus and utilizing words that they think sound nice. In most cases, a person diagnosed with Thesauritis will use the words s/he found incorrectly - therefore making him/her look stupid in front of people with bigger vocabularies.
Thesauritis patient: "I besot you so profusely; all through the ignominious opprobrium and misconstrued paroxysms... my ventricles throb with plasma for you."
You: If you knew what those words meant, you wouldn't have said that.