a relatively unknown non celebrity who is involved in music (although not many people know or care for it)and seems to think they are in legendary status and behave like they are a rockstar. Live in fantasy land inside their own head, population: 1.
changing ones first name to "vegas", then going on stage during a gig in a v small town and announcing the new name to the crowd of 5, is a beautiful example of a rocktard..
The fourth child of Shay and Katilette Carl
any loser who thinks they are a rock star just because they think they are good at guitar hero or rock band
Ted:Hey, I just beat Through the Fire and Flames on expert, I am awesome hax0r
Ben:Thats cool and all, but, seriously, I can play a real guitar
Ted:Wow, no one cares, only old people play real guitars
Musicians who see themselves and big rockstars, but are actual douches (Fall Out Boy).
Pete Wentz is such a rocktard!!
in short: poser!!!
in long: a person who thinks they are rock because they bought a green day album and a band t-shirt. these people are just basically townies except they have the intelligence to except other types of music other than dance. rocktard probably has a friend who listens to rock music.
person 1: hey check it out im a rock chick!!!
person 2: *cough* rocktard *cough*