O&O
O&O definition by Slang.net
This page explains what the acronym "O&O" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Truckers, military officers, and big 'ol nerds might use O&O to stand for "over and out." This acronym signals that a person you are chatting with is signing off for now.
The "over" in "over and out" means a person's message is finished, while the "out" means the person will be offline or unavailable for awhile. If you're feeling sassy, you can respond to O&O with Roger, which is U.S. military slang for "message received."