A persistent, iritating critic.
A gadfly journalist always tries to expose and provoke reform.
by paljoey October 1, 2003
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1. an irritating person or thing

2. someone who profits at the expense of others, a bloodsucker
He's a total gadfly! Just has no respect for others success or any real sympathy for their plight.
by The Return of Light Joker September 6, 2011
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Gadfly, Gadflies.

Social irritants immune from pesticides and rational thought.

I often feel sick when I encounter the conservative 'gadflies' that frequent this site spreading their filth, germs and rancid ideals to justify their existence!
by Sean Ambrose January 25, 2008
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Taken from Somethingawful.com -

The Internet Gadfly is easily mistaken for a troll, but is actually far more pathetic and common than the troll. Whereas a troll is an artificial construct, the Internet Gadfly is desperate to invest himself emotionally in his attempts at disruption. The Internet belongs to him and how DARE you do something of which he does not approve. The Internet Gadfly will often initially seem benign, but he will soon attach himself to the power structure somewhere - on a forum, on IRC or even on Usenet - and then things will go horribly wrong. Internet Gadfly will begin griping constantly and pushing boundaries. He will eventually attempt to foment rebellion and, failing this, retreat to a sort of sub-community that exists solely to harass the community that exiled him. Fortunately, Internet Gadfly will find many outcast comrades to take up the cause with him.
by toee May 24, 2006
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