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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A trinidadian phrase to usually said AFTER some one comes close to breaking something,it is a form of sarcasm.
person 1) knocks over appliance

Person 2) well mash it up nah.....
by bronte91 January 31, 2009
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To have sex with someone with great force and power
Yeah that Lucy I’d mash her up
I’d Mash you up
by Mayson Wordsworth October 13, 2018
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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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