A YouTube Video Mash-up is the combination of multiple sources of videos which usually have no relation with each other, other than a derivative work, often lampooning its component sources or another text. Many mash-up videos are humorous movie trailer parodies, a later genre of mash-ups gaining much popularity. To the extent that mash-ups are 'transformative' of original content, they may find protection from copyright claims under the "fair use" doctrine of U.S. copyright law.

The following (below) are just a few actual examples of YouTube Video Mash-ups that can be found on YouTube:

1. World's Finest Trailer - Batman vs Superman (Michael Keaton vs Christopher Reeve)
by silverlightsaber

2. Iron Man vs. Transformers Theatrical Trailer
by 2SunsNoWomen

3. Batman vs Iron Man trailer (Christian Bale vs Robert Downey Jr.)
by silverlightsaber

4. The Ultimate TV and movie car race. extended version
by gadget127

5. Psycho Street Hawk vs KITT
by gadget127

6. Batman vs Blade Trailer (Christian Bale vs Wesley Snipes)
by silverlightsaber

YouTube Video Mash-up by The Centurion May 4, 2013

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Milwaukee Mash-up

A sexual act involving three people whereby a man has intercourse with a women assuming the doggie-style position and a third person (man or women) inserts their hand into the bottom of the women and gives the man a hand-job from the inside.

-how'd you go last night buddy?
-awesome. Got myself a Milwaukee Mash-up after dinner.

-about time!

Milwaukee Mash-up by Wong Poker September 26, 2017

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traffic mash-up

When the music paying from two cars sounds like one song.

While driving and listening to house music, the rap lyrics in the car next to me made a perfect traffic mash-up.

traffic mash-up by sojaigirl April 30, 2013

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proper mash up !

The only terminology that can be called upon when describing someone in a state of no return. (can be used in any situation !!)

Lou: have you seen Juan Carlos's new girlfriend ?
Nat: Yeah .... shame though cause her face is proper mash up !!

proper mash up ! by Natalie Jeffers February 17, 2008

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