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Ha, no. It should have been "Site visit-cum-lunch", i.e. a visit that is also a lunch, but someone didn't quite enter it correctly...

Now that "w/" is well understood there is no reason to ever use "cum", except maybe in phrases that are entirely Latin.

'cum louder' was once spotted on a CV under the education section. Damn that spell checker... I hope.

Hey, they make educational videos.