What is Hero Rush?
1.
In Warcraft III (Reign of Chaos or The Frozen Throne), the practice of attacking the opponents base using only your hero (and any summoned units, if the hero is a summoner of some kind). Mostly prevalent in multiplayer games when there are multiple allies, thus maximizing the effect. In a Hero Rush, the opponent's workers are usually targeted first. The purpose of a hero rush is to strike early to gain a huge (and hopefully insurmountable) advantage.
Red and Pink are doing a Hero Rush on Teal. TP (teleport/town portal) to Teal now.
2.
A technique which is used in non-custom games on Battle. The players involved will immedietly build up their base as fast as possible, focusing on acquiring a hero and 3-6 low level units for a "rush" attack. Most commonly executed within the first 5-10 minutes of the game, the rush-ees will attack a certain base, focusing on units harvesting wood or gold, or in rarer cases, the main building. A successful rush can very easily render the victim useless, therefore giving the attackers a instant and strong advantage.
Alternatively, a person controlling the Orcish race can obtain a Blademaster and harass. His primary attribute is Windwalk which allows him to become invisible and on breaking invisibility, doing extra damage to the victim in subject (this is similar to a rush in some aspects, mainly targeting workers harvesting resources or buildings in low levels of completion). When done properly, a blademaster harass can completely put the victim out of sync and low on resources, which consequently may lead them to play a poor game or leave the game entirely.
Dude 1: "HAHAHA OMFG u guys totallyy got rushed, look ur so dead nub. wat an awsum hero rush. gg LOL!!!!!!!!11"
Dude 2: "Uhh, you killed one peon dumb ass."
Dude 1: "stfu".
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