When you let out a piece of sensitive, or personal information by accident. Like a Freudian slip, but with something in the real world. For example, opening your goon folder on stream, or opening your photo album in public and another person sees something really weird only you or your friends get/like.
You sitting on the bus
Your phone getting a notification and Siri reading it out:
"Your order FYJENNICC HT-V5 Chastity Cage | Lightweight Cock Cage | Resin Chastity Devices | Male Chastity Cage | Adult Sex Toy for Men | Click&Locked Key | 5 Sizes Rings Included has arrived"
You later that evening talking to your friend:
"Yeah, I was on the bus earlier today and had a Vaushian Slip, thankfully no one heard it"