A mentality of excessive concern or delight in the enforcement of obscure rules or minor offenses by a moderator or officer, often in opposition to the stated purpose of said rules.
1. A mod deleted my post because it was too short by 5 characters; this subreddit is overrun with modbrain.
2. A study from Pepperdine found neckbeards are 78% more likely to develop modbrain than the general population.
3. My keys were in the car door when a modbrain meter-maid gave me a ticket.
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.