In the world of online gaming, usually used sarcastically, e.g. when running enthusiastically into a high-risk situation where failure is immanent. Sometimes this can actually help the player's team - for example, if the enemy is distracted by the hero - but it usually is done only for amusement.
There is a famous video of Leroy Jenkins being a hero.

While playing Team Fortress 2, I decided to be a hero. I ran around as a civilian, distracting the other team while my teammates captured the control point.
by lamgood October 15, 2008
Top Definition
what people advise you not to do during mildly precarious and trivial situations
Guy 1: Hey, can you hand me that flyswatter over there? I gotta take care of this tiny daddy longlegs crawling up the wall here.

Guy 2: Don't be a hero, man
by Don'tBeAHero May 14, 2010
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