1. Someone who doesn't think before speaking. ie- unintelligent
2. A closed minded- ignorant, bigoted,prejudist, anti-cultural,intolerant or homophobic individual who usually has drowned his/her brain with alcohol.
3- a conservative with a fascist twist.
The hick saw the two men holding hands and yelled at them- then, the pea-brain drove into the ditch for not watching where he was going. Karma is such a bitch sometimes!