noun. A person who believes, argues, or attempts something that is impossible/improbable while under the false impression that it is possible/probable. A grasper might attempt to date someone out of his/her range or argue that his favorite team is going to win the championship despite not having done so in decades. Often, graspers meekly make self-serving arguments that stretch logic. Derived from the phrase "grasping at straws". Made popular originally in the DC area by WJKF's Sports Junkies.