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.