In the following paper we provide a personal definition of the existential philosophy and the existential subject. Before that we explore other historical definitions of existentialism. We were mainly interested in the relation between existentialism and nihilism, the focus of existential philosophy on the individual and the situation of the studied philosophical trend on the 1950's zeitgeist. The definition of existentialism as a form of trans-rationalism and its capacity to become a practical alternative to contemporary academic philosophy were also emphasized.