Top Definition
the act of totally ruining the grass in a previously pristine lawn

combines the words grass and massacre
"oh crap, I totally committed grassacre on the lawn with that new trimmer"

"JoeRay's penchant for farming yards in his pickup was cut short when he was taken in for questioning related to a recent grassacre incident at Sunny Valley Retirement Village."
by mzlizz August 01, 2009

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