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.
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!