"Mrs Butlerites" - People who feel the need to constantly report others to the moderators. From the poem "Please Mrs Butler, That boy Derek Drew, Keeps Calling me Rude names miss, what should I do?"
"Bizlop" - Anyone on a forum who is an expert in finance, economics, money etc. From "Banker Bizlop"
"Wizlop" - As above, but for anyone who's specialist subject appears to be masturbation.
"Bulletin Board Tysons"- People who, when faced with an internet forum, suddenly become threatening, aggressive and intimidating.
"Bulletin Board Bruno" - As above, but fail badly, with the consequence that they are unexplainably popular.
"White Shites" - Forum members who eagely rush to the defence of "poor women" , mainly by being obnoxious and rude towards male members of the forum.
"Dr Jerk and Mr Hide"- A poster with an apparent "Dual Personality" who makes provocative comments, then seems to disappear (go into hiding.) Only to reappear again later, seemingly back to his old, familiar, self.
"Morrissey" - Forum poster who disappears, never to return, at the slightest forum of provocation.
To add one I heard on Purestorm:
"Master Baiters" - People who deliberately bait or stir others, in an attempt to get them to "snap back" .