One Pinocchio

Some shading of the facts. Selective telling of the truth. Some omissions and exaggerations, but no outright falsehoods. (You could view this as “mostly true.”)

Two Pinocchios

Significant omissions and/or exaggerations. Some factual error may be involved but not necessarily. A politician can create a false, misleading impression by playing with words and using legalistic language that means little to ordinary people. (Similar to “half true.”)

Three Pinocchios

Significant factual error and/or obvious contradictions. This gets into the realm of “mostly false.” But it could include statements which are technically correct (such as based on official government data) but are so taken out of context as to be very misleading. The line between Two and Three can be bit fuzzy and we do not award half-Pinocchios. So we strive to explain the factors that tipped us toward a Three.

Four Pinocchios

Whoppers.

Pinocchio gets a bad wrap for being a liar considering this is only one small (although iconic) part of the movie.

The Washington Post Fact Checker