pontificate

The status or term of office of a pontiff or pontifex.

To preside as a bishop, especially at mass.

To act like a pontiff; to express one's position or opinions dogmatically and pompously as if they were absolutely correct.

To speak in a patronizing, supercilious or pompous manner, especially at length.

During a policy discussion awhile^([sic]) back about New York issues, when Mr. Clinton began to pontificate, she told him that he did not exactly know what he was talking about and to hush up.

"Do you hear that, Ryan? Your mommy is being a pontificating windbag."