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1.
When something goes wrong the saying of holocause is used in place of "because" to show something bad has occurred. This is also to blame the holocaust for evil things that happen in day to day life.
I crashed my car and it was all Holocause of the other driver
by JDAC1891 November 19, 2010
 
2.
Something that at least partially caused the holocaust.
This can also be used as an insult.
Dude give me back my brownie, don't be such a holocause!
by violetvegetable January 05, 2011