Standing room only
It's going to be a popular event, so expect SRO.
This page explains what the acronym "SRO" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Means all the seats in a certain location are taken, so there is only standing room available; may be announced ahead of time or text messaged to a person who is arriving late to a meeting, seminar, or other event.