to "SB" is to delete a message sent accidently via social media, usually do to sending to wrong group or person.
"Yeah, she sent me a picture, but she SB'ed it quickly"

"I don't think they were meant to send me that, but it was quickly SB'ed"
by Anjuna December 31, 2022
When someone posts into the wrong chat, or does a typo and deletes the message, leaving everyone else curious as to what it said!
Person 1: Ah didn't mean to post that here!
Person 2: Do a Simone!
by Anjuna February 04, 2022