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(N) The dopest of the dopest, usually a stoner. An Ill cat is THE man and who is a bro beyond belief. He's chill, usually high, but mostly a super cool dude. He also usually has a pretty sick name like Marcus.
Dude did you hear what Marcus did last night?

Ya man, he's a fuckin ill cat.
by bligadaga May 15, 2011
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