Top Definition
A memory lapse/loss due to longterm marijuana use.
(you get a new bong)
"I'll name you so-gnar"
(next day)
"I'll name you michelle piper."
(example of an incognizant grass attack)

simple grass attacks may occur when you misspell words, when you stop mid-conversation because you forgot what you were saying, when you forget to put deoderant on, when you miss a patch while shaving, etc.
by cash money buckets December 05, 2006
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