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1.
To blow something up in a big way. Pronounced (nine-elevened)
Yo, I 9-11ed that pussy!
by manormonkey? September 03, 2010
 
2.
To ruin, wreck, break something. Based on the word 911 when the WTC were crashed by planes.
"I totally 911ed that kid's sand castle"
"My mom 911ed my life!!"
by Kenny McKen November 19, 2005