A woman or man who is proficient at the art of the hand job.
"Hey Jim, how'd it go last night with Stacy?"
"She's no HJ Artist. It was like she was shucking corn."
A person who continually leaves unwanted posts on your Facebook wall.
"Hey Stacy, I saw that Jim left another post on your wall this morning."
"Yeah, I know. That's his third this week. He's such a wall gremlin."