A slosh brain is someone who has a mental disability, or your average person. Unaware of having any manners, drives a low "pimped out" honda civic with a homosexual exghaust pipe that he alone is the only person that thinks it sounds good. A slosh brain also can be used for African Americans that are hypersensitive about their own race, turning anything and everything into a racist remark, slosh brain runs exspecially rampant in female African Americans that think people owe them something, don't hold the door for others, speaks extremely loud for absolutely no reason, eats with mouth open, ignorant to pretty much everything in their life. Slosh brain is also the typical person that doesnt know how to drive, such as tailgating,going 35mph in a 55mph, going slower then traffic in the left lane.
Drake- "That black chick over there is complaining about white water rafting, she thinks it should be called black water rafting."
Lil Wayne- "What a slosh brain.."