DOS
DOS definition by Slang.net
This page explains what the acronym "DOS" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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In online chat, kids sometimes use DOS to stand for "dad over shoulder." This acronym is a signal that the sender's father is in the room with them, and could read their conversation.
Typically, kids use DOS to tell the person they're chatting with to avoid inappropriate subjects and language - at least until their father goes away. So if you're a father, and you just saw your kid drop DOS in chat, you may want to circle back to see what they're chatting about ...