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1 definition by Zachamon

 
1.
The official midwestern storm of June 23rd, 2009. Specifically in and around Sioux Falls, South Dakota and the Minneapolis/St. Paul Metro in Minnesota. The term was first coined on the popular micro-blogging site, Twitter.com.
Wow, my roof was completely ripped off by #deathnimbus09.
by Zachamon June 23, 2009