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Related to dirty joke: Racist joke
A joke, story, or anecdote characterized by lewd, smutty, or otherwise indecent subject matter. My grandmother was the sweetest old lady imaginable, but she had this curious fondness for telling dirty jokes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
A smutty story, as in Teenagers love to tell dirty jokes. The use of dirty in the sense of "obscene" or "indecent" dates from the late 1500s, but its application to a joke began only in the 20th century. The same sense also appears in such expressions as dirty book, for a pornographic book; dirty old man, for a middle-aged or elderly lecher; and dirty word or talk dirty, for a lewd, offensive expression or sexually explicit conversation.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. n. an obscene joke. No dirty jokes around here. We get enough of that on television.
2. n. a very ugly or very stupid person. Look at that face. That’s a dirty joke.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.