Unintentionally saying something that is straight out filthy at work. It is usually the same perpetrator over and over. While it can be followed by someone saying, "That's what she said" it is usually so wildly inappropriate, you swear the person said it on purpose and stare in astonishment, but the person really is just that innocent or ignorant.
Loudly proclaiming "The ostrich's penis was ridiculously big! Like almost dragging on the ground big" (just truly astonished at the size of something) as you walk into a meeting at work. Or starting a conversation with the boss by asking, "Can I sit on one of your balls?" (Referring to a yoga ball). Both of those are usually followed by an almost disgusted look by all who are present and someone saying, "There she goes with another Accidental Susan."
by SueSuzy September 15, 2021