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.
A sexual position made famous when "news" commentator Piers Morgan, repeatedly re posted a meme of himself on Twitter engaged in the the act with then President of the United States, Donald Trump. In this act one man pierces the anus of another man with his tongue while sitting in a swivel chair, with the receiving person balanced on another swivel chair on all fours in front of him. Both men then try to swivel as much as possible without breaking the bond between anus and tongue. Often the "Pierser" is made to be cuckold and hold the position while the man in front is pleasured to finish by a third party. This secondary act has also been called "Guest Hosting Piers Morgan".
When Donald Trump was found guilty of treason, he offered the investigator a PiersMorgan to let him send one final tweet...which he used to brag about how many people watched his sentencing.
The act of wearing a condom and wrapping ones testicles and/or pubic region in cellophane before performing intercourse with their partner while she is on the menstrual cycle.
Man: Yeah, my girlfriend was on the rag, so I had to pull a Dexter Morgan.
Friend: That must have been like a murder scene.