A Person who personafies ROCK AND ROLL, is into music, is very musically talented wheather by performing the art or having a immense knowledge of music.

Can also be a musically inclined persons nicname
"He's crushing it on the stage man, he's a ROCKDOG"
by joker584 November 2, 2006
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A rock musician or singer who, despite his/her advancing years, continues to chase the ever-fading dream of stardom; a stage-hand or 'roadie' for a touring Rock Band; an over-aged groupie or fan who continues to idolise his/her favorite band or musician.
The crusty old guy with the mullet wearing parachute pants and waving the 'Dokken' banner was a real rockdog!
by billsmerd December 22, 2008
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Hotdogs made from rocks/stones/pebbles instead of varied meats. Typically sold by pedophiles in trenchcoats from their ferraris.
Titus sold a rockdog to a unaccompanied minor from his ferrari while wearing a trenchcoat. When the child realized that the hotdog was in fact not made of dogs, Titus drove away in his hot red ferrari never to be seen again until dusk.
by Mr. Pricklepants the 3rd July 17, 2011
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