“If you use a colloquialism or 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”.
Strunk & White, Elements of Style, page 34.
Mea culpa. This is an abiding sin of mine. I will try to do better in future.