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1.
after sitting for a short or long period of time then standing up will most likey get you a head rush, a rush of very extreme dizzyness.
Jim:"whoa whats wrong?"
Greg:"Major head rush!"
by MITCHELL July 09, 2005
133 21
 
2.
When the brain does not recieve enough oxygen because of sudden changes in blood pressure. Its common to happen if you smoke some really potent marijuana and rise up too sudden. You may feel lightheaded in the beginning and experience some dimmed vision. In severe cases you may see alot of "stars" and have even more dimmed vision and it can be really intense and often leads to a panic attack. It may last up to 10mins or more. The only way to avoid this is too maybe eat something before you smoke or dont smoke so mutch if it is really potent.
Shit i got a headrush
by rndanny November 21, 2006
122 37
 
3.
When a horny chick runs full speed at a man to give him head.
When kyle told his hoes about "The Blender", they headrushed him.
by ajmelon October 12, 2010
72 34
 
4.
A headrush is a feeling of light-headedness. Headrushes usually happen if you stand up after sitting down for a long period of time. Your field of vision shrinks temporarily, and it looks like you're blacking out, but it only makes you dizzy for a few seconds until the feeling wears off.
Headrushes can cause some embarrassment, because they occur on a slight delay, so that you're already far from your chair when the feeling kicks in. If there's a table or wall nearby, lean on it for support just in case. Otherwise, just sit down or stand there for a few seconds.

If you are prone to skip meals some days, or don't get enough sleep, you are more likely to get headrushes. Frequent headrushes are crazy as hell, but get old pretty quickly.
"John usually skips breakfast, but he pulled an all-nighter and missed lunch today. Poor bastard got a headrush on his way to Biology and fell over in the hall."

"Whoa, dude, I just headrushed like crazy. I need to stop playing TFT for a while, I've been on for like three hours."
by ReySquared May 10, 2009
39 22
 
5.
smoking just enough weed to feel the changing in the weight of your head, but not yet stoned. You sort of begin to feel you head go heavy, light, and so on... a pleasant feeling
"Let's toke up man!"

"No way dude, we don't have enough to get stoned"

"We can still pack a mighty fine head rush though man!"

"I'm down."
by sebastiancee November 26, 2007
47 31
 
6.
Erection that catches you offgaurd, normally triggered by extremely attractive women.
"Dude did you see that girl?, Man I just got such a head rush."
by A Guy Named Fred January 17, 2007
20 79
 
7.
one of the best headrush is in ramadan after u fill urself up after iftar it makes u feel lightheaded nd relaxed headrush is the nice buzz you get after smoking a head of dokha
best shop yusuf ridha dokhas there will give you the best headrush ever
by hamood October 07, 2006
18 89