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See CDR/W or DVDR/W. Burning useless files to a disc, such as Windows, whereas the disc becomes worthless.
1: Dood, I burned a backup of Windows on a CDR yesterday! I'll try to use it to install Windows tomorrow!

2: Dood, you made coasters.
coaster by matt1984 May 30, 2006
a contraceptive used for protection when having sexual intercourse with a drore. COASTER = slang for condom
dude i'd put my beer on that drore as long as i had a coaster. haha yeah u dont want to leave a ring
coaster by sammythejuice September 13, 2011
a drifting, homeless person in North America, travelling 'round the world like gypsies and pirates from coast to coast
a perfect example of a coaster would have been Charles Manson
coaster by Uncle Dimma November 3, 2019
A man who inexplicably gets through multiple illegitimate pregnancies without paying child support.
"Seven up and Johnny's a coaster."
coaster by Sweet Daddy June 25, 2003
A stupid wannabee kiddo in the Quacke net!
Coaster is joining #dude
coaster by 1ct-on! January 13, 2005

coaster caddy 

The one person in your group who always wusses out when it's time to go on a on roller coaster so he/she is forced to hold the groups all the bags.
Guy 1: "are you sure you don't want to go on."

Guy 2: "There's no way i'm going on that thing."

Guy 1: "fine, but you're the coaster caddy."

Guy 2: "yeah, yeah I know. Guy 2 Is handed a bunch of bags.
coaster caddy by gubes August 12, 2014