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1.
A persistent, iritating critic.
A gadfly journalist always tries to expose and provoke reform.
by paljoey October 01, 2003
 
2.
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
 
3.
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 05, 2011