Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
Infixes are present in many languages, although English tends to use them mainly for expletives. Another example would be: “Leave me a-fucking-lone!”