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A man who thinks with his penis instead of his brain. In other words, his actions aren't rational and decisions are totally driven by getting laid.
He has been paying his girlfriend's cable bill so he has an excuse to go over there and spend time with her in hopes of getting laid.. What a dickbrain.
Dickbrain by metriccar August 12, 2012
Related Words

Dickbrains 

Well you fucked that up Dickbrains see shit for brains
Dickbrains by DJ-Xcalibur September 21, 2006

dipbrain 

someone who cant think of anything to call someone when ripping them off, so they result in calling them a dipbrain
holly "i never knew that LOL and laughing out loud were the same thing"
sophie "OMG YOU DIPBRAIN"
Someone who passes off their/their acquaintance's name as a word and defines it in a way suitable to them on Urban Dictionary
The sheer amount of dickbrains on Urban Dictionary is truly saddening.
dickbrain by TheGreatSkape January 20, 2021
a dimbrain is when someone who has a nut or bolt in their brain from being really stupid or just being a

idiot.
you dimbrain that's not what youre supposed to do.
dimbrain by mario sith July 9, 2020

disbrainment 

When you get so high your brain can not reply.

(Smoking so much reefer that you can't make a correct sentence)
I smoked way to many dabs I think I'm suffering from disbrainment.