any person or persons such as a parent, grandparent, religious group, etc. that prevents one from listening to or participating in rock music in any of its forms.
Dude: That song on the radio is pretty good. Who sings it?
Lame: That song is by Alice in Chains. Don't they worship Satan? Why don't you listen to some gospel music?
turns off radio
Dude:What a rock blocker...