A noun used to describe a stupid, moronic customer who does everything wrong, is unprepared, then blames you, the sales associate/bank teller, when you take too long, mess up his transaction, don't bend, break or change the rules to suit him, or otherwise don't preform to his standards.
"That guy is such a jeb! He expected me to give him money out of an account that his name is not listed on!!"
A short handsome man with an incredibly large penis who is always the life of the party(usually hated on by men of larger stature). A man who is charasmatic and can use his charm and humor to obtain whatever he desires including your girlfriend.
I was talking to this really hot girl until this jeb came over and stole her from me. When going to talk to women is always good to have a Jeb as your wingman.