Jimmy Jerk-off

(Noun) A hypothetical person that you see as irrelevant who is bothering you in some way. Comes from the older version of the word "jerk", meaning an obnoxious person, but turned into a name.

Use similarly to "John Doe".

"Yo, why are you leaving 10 minutes before closing?"

"I got stuff to do, if Jimmy Jerk-Off comes in here and starts giving you shit, just tell him to fuck off."