a faux pas
A faux pas is a French way of saying ‘you just wrecked the vibe.’ It’s when you make a mistake so bad, people either hate you or laugh at you for years.
I showed up to a funeral in a superhero costume and started karate chopping the casket.
I called my teacher ‘Mom’ in front of the whole class.
I asked my best friend’s girlfriend if she wanted to ‘get a little wild’ in front of her dad.