If you use a colloquialism or a slang word or phrase, simply use it; do not draw attention to it by enclosing it in quotation marks. To do so is to put on airs, as though you were inviting the reader to join you in a select society of those who know better.
William Strunk, Jr.Avoid fancy words....If you admire fancy words, if every sky is beauteous, every blonde curvaceous, every intelligent child prodigious, if you are tickled by discombobulate, you will have bad time Reminder 14.
William Strunk, Jr.