AN ACR MLG WAS HIT FROM BEHIND BY A TAXIING SMT.

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I HEARD WHAT SOUNDED LIKE A SMALL AIRPLANE RUNNING UP FOR APPROX 2 SECONDS. SOON THEREAFTER; WE HEARD SOMEONE ON GND CTL FREQ STATE THAT THEY HAD BEEN 'HIT BY THE B737.' CAPT IMMEDIATELY STOPPED THE ACFT. OUR TAXI SPD HAD BEEN SLOW FROM THE TIME WE LEFT THE RWY. 2 GND PERSONNEL APCHED WITH A GND COM HEADSET. CAPT SPOKE TO THEM ABOUT THE EXTERNAL CONDITION OF OUR ACFT. THEY LOOKED OVER THE ENTIRE ACFT AND GAVE US A 'THUMBS UP.' CAPT CONTACTED DISPATCH TO ADVISE WHAT HAPPENED. I CONTACTED GND CTL TO REQUEST CLRNC TO THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS TAXIING ON THE YELLOW LINE. HIS ACFT WAS HIT BY A LIGHT TWIN ACFT FROM THE L REAR. THE RPTR NEVER SAW THE ACFT BEFORE THE INCIDENT. THE SMT SUFFERED 'SUBSTANTIAL DAMAGE TO ITS TAIL AND R WING.' THE RPTR CONTINUED TO HIS GATE AFTER A QUICK INSPECTION. THERE WAS AN IMMEDIATE HEARING WITH THE FAA IN ATTENDANCE AS WELL AS ACR SUPVR PERSONNEL. THE RPTR NEVER TALKED TO THE PLT OF THE SMT. THE RPTR RECEIVED AN 'LOI' THEN A LETTER FROM HIS ACR'S POI EXONERATING HIM AND HIS CAPT FROM ANY RESPONSIBILITY. THERE WAS ALSO AN NTSB HEARING. THE RPTR'S ACFT WAS OTS ABOUT 4 HRS; JUST LONG ENOUGH FOR GND PERSONNEL TO INSPECT IT THOROUGHLY. THE RPTR APOLOGIZED FOR NOT BEING ABLE TO EXPLAIN WHY THIS HAPPENED; BUT HE DOES NOT KNOW.