A term used by
people of high political status, such as a mayor, a
chief, a selectman, a representative, a president, what have you. This term is commonly used to be synonymous with "I have to poop", but this version is used to make conversation less
awkward.
Barack Obama leaned over to Vladimir Putin during an interview and
said "Pardon me, I have to uuuuh...well, let's just
say I should be passing legislation."