When a person who is a mod (moderator) in a chat room, forum, etc. is overly picky about what's said by people writing. It has the tendency to take a fun channel, turn it stressful and takes the fun out of it. In many cases, they are mothers who treat users like they're their kids.
Mikey: Why did you get banned?
Jack: I was asking a real question. Someone was being a mommamod.