A state of mind that males experience when they have not ejaculated in a good period of time. This state of mind makes you horny and temps you to do to stupid things.
Rob: Dude I haven’t ejaculated in like a week
Jeff: dude ur insane
Rob: yo should I hook up with this girl (shows picture)
Jeff: Ew no dude u must have Horny brain
When you’re on a role of good ideas
“Dude, i got high yesterday and afterwards I got so brain horny”