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Someone who enjoys complaining that anyone has deviated from the main topic, being holier than thou, even to those posters who are old time regulars that choose to inject some humor that most everyone appreciates and responds to.
"Aiming for moderator’s pet? Lighten up, the group always has something funny to add."

"You're such a threadnag, get a sense of humor. Moderator's Pet."

"How long have you been humorless? If you spent less time trying to be moderator‘s pet, you'd see that his comment is relevant, it just went over your head."

“Being Moderator’s Pet will make you few threadfriends on here. Try again, without the threadnag attitude. “
by Multidisciplinary TKBL December 30, 2008