WHILE HOLDING IN LINE FOR TKOF; B737-300 EMPENNAGE IS STRUCK BY A320 PASSING BEHIND.

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WHILE TAXIING OUT FOR TKOF ON RWY 32L AT T10; WE WERE STOPPED ON TXWY J1 BEHIND AN RJ. WHILE ON THE TXWY; WE FELT WHAT BEST CAN BE DESCRIBED AS A 'SHUDDER' THAT FELT LIKE IT CAME FROM THE REAR OF THE ACFT. THE CAPT AND I WERE DISCUSSING WHAT COULD HAVE CAUSED IT WHEN I LOOKED OUT MY WINDOW TO THE REAR OF THE ACFT AND SAW AN A320 BEHIND US. THE A320 WAS TAXIING N ON TXWY J. I TOLD THE CAPT 'I THINK WE WERE JUST HIT BY AN AIRBUS TAXIING BEHIND US.' ONE OF THE FLT ATTENDANTS IN THE REAR OF THE ACFT CALLED AT THAT TIME AND ASKED; 'WHAT WAS THAT?' I ASKED IF SHE FELT THE ACFT MOVE AND SHE SAID SHE HAD. I THEN ASKED IF SHE HEARD ANYTHING AS WELL. SHE STATED SHE HEARD A 'BANG' AT THE SAME TIME SHE FELT THE SHUDDER. I RELAYED THIS INFO TO THE CAPT AND WE DETERMINED THAT WE WOULD GO BACK TO THE GATE. THE CAPT ADVISED ATC THAT WE SUSPECTED AN ACFT HAD MADE CONTACT WITH US. ATC QUERIED THE OTHER ACFT; WHO THEN ALSO RETURNED TO THE GATE. ONCE WE WERE PARKED AT GATE MAINT FOUND DAMAGE TO THE HORIZ STABILIZER AND ELEVATOR.