Well, since I was talking about music, a better definition would probably be one involving tunes. :-)
The best way to get an idea of what mashups are is to listen to a few, preferably some that were made out of songs you know. DJ Earworm has a mashup made up of the 25 most popular songs of 2007. (Further down the page, "What's My Name" is also a really impressive one.)
If you didn't listen to new music that much recently, you could try looking at a list like this one to see what you might recognize and check out a track or two. Track 6 combines songs by the Rolling Stones, Queen, and Nirvana, so I'm sure you've heard the songs it's made up of before!
Re: had to look up mashup on google . . .
The best way to get an idea of what mashups are is to listen to a few, preferably some that were made out of songs you know. DJ Earworm has a mashup made up of the 25 most popular songs of 2007. (Further down the page, "What's My Name" is also a really impressive one.)
If you didn't listen to new music that much recently, you could try looking at a list like this one to see what you might recognize and check out a track or two. Track 6 combines songs by the Rolling Stones, Queen, and Nirvana, so I'm sure you've heard the songs it's made up of before!