BOS
BOS definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BOS" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When a younger sibling watches your device's screen, you might message "BOS" to let the recipient know that your device is being monitored. It is similar to SOS but is meaner since it stands for "brat over shoulder."
Most people send BOS when texting and messaging online, like on social media or chat rooms. For example, a person may send it to warn a person not to send sensitive information, a graphic image or video, or a vulgar song.