Mercury square or opposition Pluto
You are very incisive and aggressive with your opinions. You have a tendency towards fanaticism and often want to impose your ideas on others, sometimes in a subtle manner and sometimes more imperatively. You will find yourself attracted by the occult and other mysteries but it is recommended that you avoid those subjects because they can generate certain fixations or obsessiveness. You must learn to control your impatience and impulsiveness, to think things over before speaking, and to respect the weaknesses of others.
Alternate interpretation: Never satisfied with the face value of anything, you are always probing beneath the surface for deeper reasons and hidden motives - though you rarely reveal your own. You have a very suspicious, even paranoid, side. You mind is penetrating and deep and you have an aptitude for research, investigative reporting, or private investigation. You are keenly interested in the deeper aspects of the human psyche, with a sort of "x-ray vision" regarding the inner motivations and intentions of others. You are drawn to anything secret, hidden, or mysterious, and may pursue esoteric or occult studies. You are also a forceful and convincing speaker or writer, with the ability to influence peoples' thinking by the sheer power of your conviction.
Courtesy of
http://www.cafeastrology.com/natal/mercuryplutoaspects.html
When we look at squares we also look at the houses Scorpio rules ie;4th and Mercury rules Asc and MC. So from 11th house of large orgnisations, groups, friendships etc is square to Pluto in 3rd causing tension and poss too forceful speech on occasions that also affects the Asc & MC ie; the way you communicate and present yourself professionally. Sometimes we are not always aware of how 'we come over to others' and this square is capable of 'verbal lacerations' but you would/should know and use this sparingly...