MOS
MOS definition by Slang.net
This page explains what the acronym "MOS" 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 MOS to stand for "mom over should." This acronym is a heads-up that the sender's mother is in the room with them, and can read their chat conversation.
Most often, kids use MOS to tell those they're chatting with to avoid inappropriate subjects and swears, until their mother goes away. So if you're a mother, and you just stepped away from your child's chat conversation to look up MOS, you may want to go back and see what your kid's talking about now ...