1)Someone who is so intoxicated by alcohol that they are unable to master even the simple act of standing up.
2)The act of becoming so intoxicated by alcohol that the simple act of standing up becomes a mighty challenge.
Last night, he was mash up!

I'M MASH UP!!

Let's all get mash up!
by dan258 December 8, 2003
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Irish word talking about a way to cook some spuds by breaking them down. Adopted by Jamaicans to describe breaking up other people's tings.
If he dont bring my weed im gonna mash up im bloodclaat yard
by hairy mo April 18, 2004
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Konnor: You go to that Girl Talk concert? That was off the hook.
Josh: Yah man those Mash Ups were insane!
by KonArtist38 January 1, 2011
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In gaming, the combination of multiple genres in one setting.
Shadowrun: mash-up of cyberpunk and high fantasy
Rifts: mash-up of cyberpunk, high fantasy, horror, post-holocaust, and new-age mysticism
Cthonian Space: mash-up the Cthulhu Mythos with space opera.
by akaramis December 24, 2010
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a mash-up is slang for a get together of similarly minded people so that they might partake in the consumption of drugs and/or alcohol. people on a mash-up get mashed.
mash-ups usually take place at night, but usually go on well in to the morning of the following day (they tend to wind down when the alcohol/drugs run out). unlike a cotch, mash-ups can take place anywhere, in or outside.
H: YOOOOO MAAAAAAAAAAAAAAAAN, on for a phat mash-up tonight?

M: YEAAAAAAAH BLID, let me ring fattypants whitworth and the filthy pikey, see what they's sayin'

H: bring some shroooms blud

M: wouldn't be a mash-up without them
by mr 9" September 3, 2007
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(of a DJ) to play a set that excites the crowd
That was mash up me bredrin!
by piffy June 12, 2003
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To make a hot drink
your going to ''mash up''
''I'm going to mash up, do you want a coffee''
by Twitchyxx8 July 23, 2009
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