"I walked slowly down the street to school" becomes "I sauntered languorously down the boulevard to the establishment of education" (this is overly thesaurused)
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 accidental construction 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 understand the definition of to make yourself appear smarter to the reader.
"Man, Julia's essay would have been amazing if she hadn't thesaurasized the damn thing. Now she just looks ignorant."
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.