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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
 
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