Boner-Brain 

When ones intelligence level decreases as blood flow levels lower in brain to accommodate the needed increased flow to the penis during a erection.

I can't do math right now, I totally have boner-brain.

Boner-Brain by JDiddy2Pretty November 11, 2015

Boner Brain

The phenomenon when a males mind becomes filled with extremely sexual thoughts when one has a boner. In other words a person thinks with their boner.

I had a serious case of boner brain in class and almost spunked my pants thinking of fucking Ms. Williams

Boner Brain by TadBitOfThad May 11, 2015

Boner brain

when one has the inability to speak or function because all of the blood has rushed out of their head to their boner. generally makes the affected person very stupid for the duration of the boner. mainly occurs to men with large schlongs.

"she told me i could touche her boobs and i wigged out, i think i said 'i don't need to.' I NEEDED TO."

"Total boner brain dude, ouch."

Boner brain by twiceonsundays November 16, 2011

Boner-Brain Barrier 

When your boner takes over thinking for your brain. Similar to the Blood-Brain Barrier where only certain substances can pass through to the brain. The Boner-Brain Barrier doesn't allow any thoughts to be processed from the brain since they are all processed from the highly sophisticated thinking center of the penis. This can result in making illogical decisions and having regrettable sexual experiences.

Hey, why'd you make-love to that 350lb manatee last night.

Three words, man... "Boner-Brain Barrier"

Boner-Brain Barrier by The definer2017 February 4, 2012

brain boner 

Something that strikes a chord in someone's thinking, creating a spur of "enlightenment" and stimulation in knowledge, especially in subjects like philosophy & logic.

John: Hey, have you seen that recent philosophical discussion between XXX and YYY on YouTube?

Peter: Yeah, it was so good it gave me a brain boner.

brain boner by nullswitch March 6, 2011

Brain boner 

The feeling you get when you are having a lively discussion or listening to an engaging lecture and everything makes sense and it gives you a bunch of new ideas about the topic at hand. The intellectual equivalent of an erection.

DeSean: oh man, that lecture given by Dr. Kobilka about G protein-coupled receptor dynamics gave me a massive brain boner.

Derrick: uhh...right, yeah, totally dude. *pssst* Jimmy, I think we need to re-evaluate our friendship with DeSean...

Jimmy: agreed.

Brain boner by Longrod Von Hugedong May 26, 2016

Brain Boner 

When you are so intellectually stimulated your brain gets a boner.

You: Did you guys check out my new 3D TV?

Me: Yeah, major brain boner.

Used when describing something that intellectually "turned" you on.

Brain Boner by The Comet March 26, 2011