Talking someone's ear off. Rambling on while not getting to the point (jaw-jabbin). Trying to engage someone in a long-winded conversation who is obviously trying to get to the point and get on with thier day. Also known as being held as a "conversation hostage".
"I went to ask Renee a quick question and she earjacked me for 30 min. She's always earjacking people!"
The act of stealing expensive earrings off of a person usually achieved quickest by slicing the entire ear off and driving down the sidewalk in a motorcycle to get away.
"Damnnn! That bitch just got earjacked, I bet if those weren't Harry Winston she could still hear."