An shortened version of the term "aggravated". You hear it often used in MMORPG's as a way of telling others who the mobs are attacking. In most MMORPG's it is the duty of the Tank to keep "aggro" (having all the mobs attacking him only) so the DPS players don't have to worry about dying and the Healers don't have to worry about healing the DPS players or using AOE healing moves.
Sirkillsalot (DPS): Hey amazing, I just pulled aggro on the goblin.
Iamamazing445 (Tank): I'll come get him.
SparklezznHealzz (Healer): I don't have enough mana to heal both of you.
Sirkillsalot (DPS): I'll come to middle, just use an AOE.
SparklezznHealzz (Healer): Ugh, okay. Amazing, I need you to keep your aggro, my AOE's are weak.
Iamamazing445 (Tank): Yeah, yeah, got it sparklezz.
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RandySavage001 (Tank): Guys, you're doing too much DPS, I'm having a hard time keeping aggro on the Witch Lord.
Death2BabySeals (DPS): I can help dual-tank to keep aggro off of DPS.
Biblebasher1 (Healer): Yeah, then I can focus on AOE heals, so even if you do lose aggro DPS should be safe.
Death2BabySeals (Tank): Pulling aggro now.
by Rusel Crow December 2, 2013
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1. Aggressive
2. Angry
3. That mountain on the one nickoldeon show Global Guts the Aggro Krag
1. OMG OMG THT MONSTXOR IS TEH AGGRO!
2. JESUS H CHRIST THAT HOMEWORK MADE ME AGGRO
3.Look at that retarded kid he cant even climb the aggrokrag
by Nate January 23, 2005
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Shortened version of aggravated.

Crazy wild.
Don't get all Aggro!

The line was so long, and it was so hot, I started getting totally Aggro.

He wanted to fight, so I just went totally aggro!
by octavius March 10, 2004
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Having the attention of someone/something.

Often used term in the game "World of Warcraft".
Casters, if you pull aggro you need to dump it.

Wait for the tank to aggro.

Be careful that you don't pull aggro.

Hunter pulls, tank aggros, kill the marked.
by MePoop April 20, 2006
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getting all mad at somethin for no reason
You know, you didnt have to go all aggro on that speaker box.
by zack January 6, 2005
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1. Short for agricultural.
2. Short for aggregate.
1. Father is an agro phile in Texas. Mother's on the bar most every night.

2. I don't want to hear the inter ludes, just tell me the aggregates. Got that? Just the aggros.

3. You need to add a lot of aggregate or you are going to run out of cement. So go heavy on the aggro
by Tommie T June 29, 2009
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usually meaning Industrial Metal, but also could mean agressive
by Edwin December 27, 2003
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