When an anime decides to build you up and attach you to a character or host of characters, only to violently rip them away from you in the end of the series, leaving you with no closure. It seems Gainax has a knack for producing animes that follow this trend. Neon Genesis Evangelion and Tengen Toppa Gurren Lagaan are a few examples of gainax productions that do this, however you may use the term to describe any anime that does this. Common among mech animes.
I am afraid to watch any mecha animes... they are just going to have gainax endings