becoming so high that you puke. some people even turn green.
Dude, I totally greened out at Kaylee's place last week.
by lilith fair July 31, 2006
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A green out is a cannabis induced physiological or psychological panic attack. Symptoms include sweating, nausea, heart palpitations, hypervigilance, paranoia, and the fear or feeling that you might be dying or about to die. A green out is typically caused by smoking or ingesting too much cannabis too quickly.

Green outs are generally brief experiences and may be followed by exhaustion or drowsiness, or a rapid sobering.

Unlike black outs, memory loss doesn't tend to occur during a green out due to the intensity of a green out.

Memory loss is much more likely to occur during a long, sustained session of cannabis use.

Unlike alcohol, cannabis use affects short term memory (what was I saying?) and not long term memory (what did I do last night?).

Sativa strains may be more likely to cause green outs (while indicas are more likely to leave you stoned)
Person 1: Dude, don't smoke so much. you'll green out.
Person 2: pshh, green out, sure, whatever.
(green outs vary depending on the circumstances so it's difficult to describe a specific example, and it can take multiple green outs to really understand what's happening when you have one).
Person 2, now an experienced pothead: Dude, don't smoke so much. you'll green out.
Person 3: pshh, green out, sure, whatever.
by thatonespecificguy April 8, 2018
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After smoking (normally Marajuana) you may experience greening out.

Greening out basically is when you smoke and get really sick. Normally it comes with dizziness, impaired vision and balance, passing out, nausea, or in some extreme cases vomiting. You may also become sober extremely quick. Sometimes you may also experience chills and cold sweats. Normally, in most cases, it happens with non-smokers who are doing it for the first time.
Person 1: "Man I just took a fat ass dab and now I feel sick."
Person 2: "Bro your greening out, fuck!"
by Chungus_FootFungus September 11, 2020
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Makes you feel like shit for the whole night;

Makes you pray to god that you'll never smoke weed again,

Makes you say sorry to the person taking care of you, because you know in your head you just sobered them up & ruined their night,

Makes you feel like you're falling into quick sand, and your hand movements seem amaizing.

Makes you question if you've fried your brain, and this will never go away, and you'll live like a vegetable for the rest of your life.

J:"Yo man yo man yo man I think I'm greening out"
M:"No no no!"
by JTP18 January 18, 2009
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smoked too much weed and your just fuuuucked, might puke even or just fall asleep
Example of a terrible green out:

I was with my 2 friends, we got baked as shit for like and hour and then went to the buffet, i fucken pigged out then we went to mcdonalds to get something to drink (dollar drink days!), I drank a litre of cola and then i felt really sick, started getting codl sweats and then i puked in my cup, then my friends cup, then my other friends cup and filled em all up except the last one....people were looking at me like WTF!!! i think they were anyway, i threw the puke out and we bailed

then I felt sober as fuck and realllly good, like puking after drinking...but i wanted to get high again before the movie, so we hot boxed the car and I was fucked up again and then we saw get him to the greek, i dont remember anything about the movie
by cuppy cupperson July 8, 2010
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Involves constant throwing up and feeling extreme nausea and dizzyness for the rest of the night, possibly with continued vomiting later on. In more extreme cases, the person in question may experience hallucinations.

Occurs when someone smokes a lot of marijuana in a short period of time. Common amongst those who want to prove their masculinity somehow by smoking large amounts, usually through peer pressure.

Usually ruins the night for everyone else, as it means they must look after them and take them home. So people who green out often aren't very popular with the rest of the dope heads.
Person 1 : "Wheres he going? Oh no, he's greening out."
Person 2 : "For fucks sake, not again."
by OiOiBoy July 1, 2006
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To smoke too much marijuana over a long period of time, or too much in a short, quick period, and vomiting; To become completely, and utterly fucked. Everything goes spinny, you feel dizzy and tingly, and eventually yak, and pass out.
Johnny: Bro, danny just yaked, do you think he's gunna Green-Out?
Danny: Yo, slow down, i need to lie down man..
Rick: No man, you gotta stay awake.
*Danny passes out*
by Thunderpuffs August 26, 2008
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