SRO
SRO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "SRO" 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 you're discussing events, SRO signals that an event will be "standing room only." This means that, if you attend the event, you shouldn't expect to get a seat.
You may encounter SRO in texts, emails, forum posts, or any other type of message in which someone is discussing an event. However, you're most likely to receive SRO in messages sent by a friend or co-worker who is attending the same event as you. If they tell you the event is SRO, that's a heads-up that the event won't have seating available.