Abstrast expressionalism

A painting movement in which artists typically applied paint rapidly, and with force to their huge canvases in an effort to show feelings and emotions, painting gesturally, non-geometrically, sometimes applying paint with large brushes, sometimes dripping or even throwing it onto canvas. Their work is characterized by a strong dependence on what appears to be accident and chance, but which is actually highly planned.

http://www.artlex.com/ArtLex/a/abstractexpr.html