The word was coined by Edward Lorenz.
It is described as the sensitive dependence on initial conditions in which a small change in one state of a deterministic nonlinear system can result in large differences in a later state.
Got that? He named it the butterfly effect because his studies show that the single flapping wings of a distant butterlfy has affected a hurricane at a later date.  

Simply put, A very small change in initial conditions has created a significantly different outcome.

Wouldn’t you love being dubbed as the Butterfly Effect of a certain big deal at where you work? or how you changed someone’s life dramatically?
One person, One phrase, One Act can change so much.

So what was your butterfly effect act?