Top Definition
a nickname of the operating system 'Windows vista.'
It seems to be coined by combining 'Vista' and 'disaster.'
Windows 7 is faster and much more reliable than Visaster.
by ilinri September 15, 2009
A visit from a relative or friend that unexpectedly turns into a disaster.
My sister came to town right after her boyfriend broke up with her; what a visaster.
by MarkyDProductions November 23, 2012
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