Plead the fifth comes from the Fifth Amendment to the United States Constitution, which protects people from being forced to testify against themselves in criminal cases. Over time the phrase left the courtroom and became everyday American slang for refusing to answer. Online, i plead the fifth meme clips are shared whenever someone is caught in an embarrassing or suspicious moment and chooses silence over explanation. Its popularity endures because the wording sounds official and dramatic, even when the situation is completely trivial.