A phrase that is mindlessly repeated without question.
One of the most famous Anderson Coopers was made in 1957 when people repeated as truth that spaghetti grows on trees. They were taken by the April Fool's television broadcast that depicted Spaghettit being harvested from Trees.
Wow, did you hear the Anderson Cooper last night? The debate moderator regurgitated the talking point that only 47% of Americans pay taxes. --Yeah, man, that's some lazy reporting.
Also, a person who believes whatever he is told or is easily manipulated.