Any man who ejaculates almost immediately after the beginning of intercourse with a female. The term was first coined by a few students of the Pasadena High School Senior class of 2008 in Pasadena, TX. While discussing their mutual hatred for a self-righteous nobody (named justin), one of the young ladies tells the story of how one of her friends (who shall remain nameless) was persuaded into having sex with the male in question, only to have him ejaculate way too prematurely. Justin was said to have "lasted only two minutes before he came. What a fucking pussy." The term has since then been attributed to him, but has been used to describe any man who has performed such shameful actions.
Girl 1: So...did that guy you met give you the night of your life, or what?
Girl 2: Night? What an overstatement...that douche turned out to be a two minute justin...what a dud.
Girl 1: Ouch...