A remix made by taking two different songs, usually by 2 seperate artists, and combining them into one.
Closer in da club (Nine Inch Nails: Closer, combined with 50 cents Up in da club)
One Step Closer/99 Problems (Linkin Park: One Step Closer, combined with Jay-z's 99 Problems)
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.
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
Getting drunk, then high, then awesomely stupid for a period of indeterminable length, but generally must last at least an evening plus all night and some of the morning. Mash-up heads will take anything to increase the length of time to talk nonsense. Evening ends with possible bed wetting episode or discussion about love/drugs/energy/music. Pizza is often ordered the next day.
-Me gonna get mmmmmmmmmmmash-up.
-"Is that Tom over there fucking up his mixes, he sure is a shit deejay."
"Cut him some slack, he is mash-up."
-Look, its my day off tomorrow and I wanna get totally mash-up.
-"Mash up, get me crack up, on the rack up, shut up and smack up, on a track up" Apocryphal song attributed to someone who is mash-up creating a new and awesome track.
-You look mash-up.
-Mum, I got fuckin mash up last night.