1. What does it mean?
어그로 comes from gaming 'aggro.' In a game it can refer to drawing an enemy's attention; in online discussion 어그로를 끌다 means provoking people to attract reactions.
Also written or said as eogeuro
2. The nuance
A provocative headline can be called 어그로 even without a game involved. Disagreement alone does not prove deliberate baiting, so avoid using the label to dismiss every unwelcome opinion.
3. Examples
“제목만 자극적이라 어그로 같아서 본문부터 확인했어.”
The headline looked like bait, so I checked the actual article.
“탱커가 어그로를 잡는 동안 뒤에서 회복했어.”
I healed from the back while the tank held the enemy's attention.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.