a combination of the words "cum" and "summary."
It is a (summary) or collection of people, cumming together to engage in sexual activities which result in cumming.
aka orgy.

1. to cum to twilight characters or actors.
2. girls who usually put summaries together with sex.
3. cummaries usually happen in the shower.
4. cum in summaries.
5.sexy summaries with a little extra something.
6.something that happened in a twilight community (twispammers)