Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Chiefly British Slang Aggressive or violent behavior.
  • n. Chiefly British Slang Irritation or exasperation: "Postponing new hospitals and roads causes far less aggro than sacking town hall or Whitehall workers” ( Economist).
  • adj. Slang Aggressive or violent.
  • adj. Slang Daring and skillful, especially in a sport such as surfing.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Aggravation; bother.
  • n. Aggressive behavior; loud, intimidating behavior that convincingly threatens violence without necessarily actually becoming violent.
  • n. A measure of how belligerent a player is – a high value may inspire either avoidance or preemptive hostile action from enemies.
  • n. Hostile attention from an enemy gained by acting belligerently.
  • adj. Angry.
  • adj. Liable to attack without being attacked first (said of monsters).
  • adj. Hardcore, aggressive.
  • v. To become aggressive towards the player's character.

from the GNU version of the Collaborative International Dictionary of English

  • n. aggravation or aggression.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (informal British usage) aggravation or aggression

Etymologies

Short for aggravation and aggression.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From aggravation +‎ -o (“diminutive suffix”), influenced by aggressive. (Wiktionary)

Examples

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