:coaster: n.
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1. Unuseable CD produced during failed attempt at writing to
writeable or re-writeable CD media. Certainly related to the
coaster-like shape of a CD, and the relative value of these failures.
"I made a lot of coasters before I got a good CD."
2. Useless CDs received in the mail from the likes of AOL, MSN, CI$,
Prodigy, ad nauseam.
In the U.K., beermat is often used in these senses.