Q: A delightful teenager in my life just texted the word “coinkydink.” I used this term for a coincidence at her age (circa 1975). Any idea when it was coined? I have a vague memory of hearing it in some old black and white movie.
A: The earliest example we’ve found for “coinkydink” (often spelled and pronounced “kawinkydink”) is from the June 1952 issue of Trolley Topics, a publication of the San Francisco Municipal Railway. The term appears in an “Office News” item about trolley employees:
“Just after bowling his massive 696 series in the Association sweepstakes, Jimmy ‘The Arm’ Dickinson reached into his wallet for a look at a raffle ticket that he holds. Lo and behold, the number it bore was 696 also! A charming ‘coinkydink,’ as Jim Pagee says.”
The Random House Dictionary of American Slang describes “coinkydink” as an “intentional malapropism” used jocularly to mean a coincidence. (A malapropism, as we wrote on the blog in 2007, is an unintentionally comic misuse of a word.)
The earliest example for “coinkydink” in Random House is from a 1969 episode of Rowan & Martin’s Laugh-In on NBC-TV: “Isn’t that a coinkydink?” This may have been the source of your vague memory of having heard it in an old movie.
We haven’t found “coinkydink” (also spelled “coinkidink” and “kwinkydink”) in any standard dictionary, though readers have submitted the term to Merriam-Webster Online‘s Open Dictionary as well as to the collaborative Urban Dictionary. And the popular online reference Wiktionary describes it as a “jocular alteration of coincidence.”
The use of “coinkydink” for “coincidence” is sometimes referred to as “eye dialect,” though that term (coined by the language scholar George P. Krapp in 1925) usually refers to the literary use of a nonstandard spelling to indicate the pronunciation of a poorly educated speaker.
The lexicographer Grant Barrett, in a April 2, 2008, post entitled “Saying it wrong on purpose,” says he and his wife, a linguist, often mispronounce words deliberately, as do many other English speakers.
“People speak that way because saying a word wrong on purpose is a form of wordplay,” he writes. “It adds variety, colour, and whimsy to our speech. It’s a common characteristic of slang, which is partly built upon fooling around.”
Barrett says he and his wife “sometimes say chimbly instead of ‘chimney,’ fambly instead of ‘family,’ and liberry instead of ‘library,’ ” among other deliberate mispronunciations.
“Many Americans also say coinkydink instead of coincidence,” he adds. “It’s sometimes spelled kwinkydink or kawinkydink and is almost always used in a light-hearted or goofy way. It refers to when two or more things happen in the same way, at the same time, at the same place, or to the same people in a way that is surprising. Although you know they’re not related, they seem to be. Coinkydinks are interesting but unimportant.”
from Grammarphobia http://www.grammarphobia.com/blog/2016/12/coinkydink.html