When you see a phrase related to a movie or TV show in text and you immediately hear the actors voice in your head as you read it.

Examples: "Hasta la Vista baby." "Say hello to my little friend." "Here's Johnny!" "Sickness must be purged."
The reason this is referred to as "The Morgan Freeman effect" is because Morgans voice is so distinct and ingrained in peoples memories that it is notoriously and extremely easy to recall when seeing his picture or reading a quote by him.

An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.

The effect where, when reading a passage of text, the internal monologue is in Morgan Freeman's voice rather than your own.

When a person is attractive as a whole, but has a few qualities that are unattractive. The Morgan Freeman Effect states that those unattractive qualities become just as attractive as the other qualities. It is called the Morgan Freeman Effect because when you look at Morgan Freeman, a semi-decent actor, with a more than amazing voice, you think everything about him is extremely fantastic. This happens because of the one quality he is famous for, his soothing, gentle, massaging voice. This makes the fact that he is an okay actor completely irrelevant, because he is fucking Morgan Freeman.

The Morgan Freeman effect occurs when a God-like actor such as Morgan Freeman appears in an otherwise awful movie and makes it awesome just because he is in it.