Groentjuh

"to do a Groentjuh":

To mention vital or (more) detailed information in chat messages completely enclosed in parentheses, often after a preceding message roughly addressing the topic.

Or, more general: simply the act of putting chat in parentheses which is more than a mere comment and is likely to trigger replies/discussion about it.
<Bob> There are no reservations yet.
<Bob> (but I guess there'll be a lot by tomorrow)

<Alice> (Hello everyone!)
<Alice> (What's up?)

Both Bob and Alice "did a Groentjuh" above
by Notausgang May 17, 2008
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