What is the meaning of Aggro?

Aggravation; bother.

Aggressive behaviour; loud, intimidating behaviour that convincingly threatens violence without necessarily actually becoming violent.

A measure of a player's level of belligerence.

Hostile attention from an enemy that should target players with better defenses.

Angry.

(Can we verify this sense?) Aggressive; inclined to attack .

1. Of a deck, designed for aggressive play that seeks to defeat the opponent in the early stages of the game.
2. Of a player, favoring such decks.

Of a deck, designed for aggressive play that seeks to defeat the opponent in the early stages of the game.

Of a player, favoring such decks.

Hardcore, aggressive.

To become aggressive towards the player's character.

To cause (a non-player character) to become aggressive towards the player's character.

Source: wiktionary.org