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Brain Boner 

An idea.
I had a raging brain boner the other day. Space Suits for cats is a good idea, and don't let anyone tell you otherwise.
Brain Boner by earlgreytea23 November 23, 2018

Blue Vain Brain Boner 

Something that strikes a chord in someone's thinking, creating a obsession of "enlightenment" and stimulation in knowledge, and gets obsessed in his/her thought pattern until his / her thought/idea wears off or the thought gets put into action.
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 blue vain brain boner.

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 

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 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"