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1.
The ability to understand rock and metal lyrics
Song in question: psychostick - beer

Drew: What the hell is that guy saying after he said "Beer is good"? it sounds like he said "a truck".

Friend: Nah man, he said "and stuff", you gotta have rock ears to understand it man.
by Drew&Cham April 03, 2007
 
2.
The ringing sound in one's ear after attending a concert or show.
Dude1: How was the show?

Dude2: What?

Dude1: How was the show!?

Dude2: Sorry man, can't hear you. I totally have rock ear from the show!
by Spudinthebox June 07, 2007