Sac jockey
A person who is constantly bothering you or biting your style. Thus, they ride your sack like a jockey rides a race horse.
"Hey Tom, here comes Jim."
"Yeah, I see him."
"Why does he have to dress just like I do?"
"Well, he's a sac jockey."
"Yeah, I see him."
"Why does he have to dress just like I do?"
"Well, he's a sac jockey."