The opposite of a Broton, this guy is a bad influence of another guy, though age here is not an important factor. Thieves, gang members, and other thug types qualify.
Practically all the people your parents warned you about.
bro·tard·ed broh-tar-ded
–adj.
1. notably bad; horrible - That singer was brotarded!
2. violently drunk; disagreeable drunk - Ted gets brotarded when he drinks.
3. used for consoling others through sympathy - oh, that's brotarded!
Frank: John drank too much and was totally brotarded last night. He really needs to get his life under control
Tom: Yeah man, sounds like a bad night Frank: Yeah, it was utterly brotarded...