ONE HOUR DIET, this term is used in a business social setting to indicate that a member is not exactly invited to a business
lunch. So if an employee knows that there’s an invitation a large
group they’re going to and they need to politely protect themselves instead of saying “why wasn’t I invited”, they could say I am on OHD. This gives an indication to host or other members that no invitation was received, in a way that protect the feelings of both
ends. So host don’t feel entitled, and other
end don’t feel rejected.