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A member of the mint family of plants (aka catmint), Nepeta cataria.

Irresistable to cats, its mildly stimulant properties can trigger a large range of behaviors that can be collectively described as 'flippy' but also happy.
If cats had dealers, they'd buy catnip.
by xyz April 19, 2005
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2
A drug for cats. It tends to make them crazy, excitable, & generally a lot funnier
I gave Whiskers some cat nip last night & she went nuts!
by D.C.B. July 10, 2006
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4
Cheap,affordable, yet not as strong as weed.You can smoke this stuff. it won't get you high though.it will only relax you and make you want to sleep.
me and my friend smoked some Catnip in his room and then listened to Nine Inch Nails.
by iwannabeanalcoholic August 27, 2004
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-"dude, what's up with your cat?"
-"Oh, he's just high off that catnip I got him"
by harvey45 January 02, 2009
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6
A young male who is irresistible to older women, specifically cougars.

Catnip makes cougars go crazy until they lose all of their inhibitions and have to have the catnip at all costs.
Damn that smoking hot cougar bitch couldn't keep her hands off me. She must think I'm some high-grade catnip.
by Catnip69 July 28, 2010
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