A good part popularized by celebs and hip hop songs like Black Eyed Peas - Boom Boom Pow. The female artists in the song sings, "Them Chickens jackin' my style. They try to copy my swagger. I'm on that next shit now."
swagge jacker is said by many rappers
A person who doesn't know how to be themselves so they copy your style, hobbies, interests, etc. They try to sound and be just like you. They even go as far as taking your ideas and/or habits and claiming them as their own. They intently hang on to every word you say so that they can repeat the exact same thing next week. You will also find that they are very jealous of you as well. They hate the fact that they can not come up with unique views and opinions on their own like you do. Do not think it is strange when you have a nagging feeling that they are talking about you behind your back while smiling in your face. Saying hurtful and mean things about you helps to soothe the burning dissapointment of not being able to be YOU.