What does means "Re: <slightly OT>...." in the subject ? ...

[chris]

On Tue, 2011-09-27 at 12:19 +0800, Goh Lip wrote:
> On 27/09/11 11:50, Ric Moore wrote:
> > <OT> would be to jabber on about the rain in the plains of Spain.
> > <slightly OT> would be to jabber about using Ubuntu at a Meteorological
> > station, located at a plain in Spain. :) Ric
> > --
> 
> Anything from Ric should be labeled <Ha Ha>   :)
> Regards - Goh Lip
> 

and medium off topic.  :-)