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 !!
by Natalie Jeffers February 18, 2008
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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
by The Centurion January 26, 2013
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To perform the act of anal sex on a woman. To fuck a girl in the ass.
Last night i was mashing up a girl's dinner and i got shit on my dick!
by patyouth711 July 17, 2009
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When a phallus looks like it's pressed between two panes of glass. Credit to Tommy of Browntown Podcast
"We had intercourse, and that was good to know it wasn't all mashed up, said Heather about Paris."
by Elle Bea June 23, 2022
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The disastrous results of shitting yourself and seeing what the contents of your undergarments look like
Egad I've got 3 and 3/4 lbs of mashed up Dundee cake in the seat of my pants right now
by Mon nom de plume est Satre August 26, 2016
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When a person gets bored of one persons vagina so has to swap from fanny to fanny. Also if a person does not get action from his girlfriend or only once or twice a week so finds other girls so he can get gash all week.
Joe: Woww i've got a proper gash mash-up this week lillie on monday then ellie tuesday then my girlfriends sleeping over wednesday but friday i think i will see Georgie.

Jack: Ahh cant be arsed my girlfriends fanny is to tight i get bored might as well go fuck Georgie.
by sbvodka July 28, 2010
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Put a banana in a sock, mash it up and put it in microwave for 20seconds. When done put it over your penis and start masturbating.
(20 secs only so you dont burn your knob)
I'm going yo get home and have a mashed up monkey
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