is: providing one with unclear/wrong/false information about the current situation and/or misstating/misprinting one with actual truth that helps to understand the situation better and to evaluate the outcomes.

purpose: make you wait as long as it possible until the decision is made - usually not to your likable outcome

common for:
1 (anything whatsoever): keeping something on hold but knowing they won't need it or use it.

2 (interpersonal):
a) situations when someone can't make up their silly mind and try to take their time until they finally decide that they don't need you anymore;
b) "just in case"; "plan B"; "fuckable alternative"

leading to: false understanding of situation; irrelevant priorities; wasted time; faded dreams; fucked brain. yes.
1)
- So is John buying a car from you ?
- I dunno really.. he haven't gave me any clear answer yet, but asks to wait for one more month
- Umm.. sounds like brain fucking to me, really.

2)
- He doesn't call me, doesn't want to meet up, but send me sms's that miss me once a week ! I don't understand !
- He's fucking your brain, thats all.
by i.o. January 23, 2007
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The condition usually experienced after regaining consciousness after tripping your balls off (using LSD) as your mind attempts to recover. Symptoms include a feeling of general stupidity and the soreness one would associate with having a large phallus shaped object repeatedly shoved into the depths of the cranium, no lube.
Oh, brain fuck.
After dropping that dose last night, my brain fuck makes me feel as dumb as a fucking rock.
20 hits of acid will cause a serious brain fuck.
by theoneyiv December 6, 2009
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To screw with someone's head, by using deceit, taunting, and name-calling.

by kingkevin November 14, 2006
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Something so difficult and confusing that it makes your head bobble like if it was getting fucked in the brain REPEATEDLY!!
"Math class today was so hard, right?" Ray said.

"I know it felt like our math teacher just brain fucked me, HARD!" Alvaro replied.
by RNICK March 15, 2010
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1. the point at which your brain is processing so much information that you feel so tired

so much so as if your brain is being fucked/raped by information

2. the point of which something is too hard to comprehend
dude 1: dude, that test was so hard!

dude 2: i got brain fucked.
by s-fly March 19, 2009
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the intentional probing of someones mind so that they think contradictory to the truth or your beleif for your gain, concept can also be reversed so that they beleive in your truth may it be false or the actual. best results when victim is unsupecting
dude how much was that ice cream.

like 5 bucks (actual price: $2.50)

heres 5 bucks go buy me one

shoots........ heres ur ice cream, it was actually $6.00

O, heres another buck, thanks alot

"wow i just totally brain fucked him, wat a dumbass"
by Brycen Phillips July 30, 2008
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form of;/ courting ritual generally used by professional/cranium loving people to entice the intellect (aka brain/largest erogonous zone).. necessary connection if one hopes to fornicate with the highest form of cromagnum man (woman)

male version_"dude that chick is hot,"yah but i dont have the energy to brain-fuck her tonight"
female version "Sister, he's cute but he hasn't brain- fucked me yet"
by urban ruby October 29, 2007
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