A G159 TURBOPROP FLT STOPS TAXI AFTER LNDG ROLL AND FAILS TO CLR THE RWY COMPLETELY WHEN THE CREW IS CONFUSED AS TO WHAT ATC WANTED IN THE WAY OF TXWY USE AT IAD; VA.

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WE WERE CLRED TO LAND ON RWY 19R AT IAD. ON OUR ROLLOUT; WE WERE TOLD TO TAKE TXWY Y7 BY A CTLR WHO SEEMED TO BE ANXIOUS. AS WE WERE MAKING OUR TURN OFF THE RWY; THE CTLR AGAIN SAID TO TAKE TXWY Y7 AND ADDED THE WORDS 'THE FORWARD TXWY ON THE MOST FORWARD TXWY;' WHICH CREATED SOME CONFUSION IN THE COCKPIT. MY COPLT IMMEDIATELY EXPRESSED HIS CONFUSION AS THERE WAS THE HIGHSPD TXWY WHICH LED TO TXWY Y7; WHICH IS WHAT WE WERE DOING UNTIL WE HEARD THE WORDS 'FORWARD TXWY.' THE FACT THAT WE WERE BOTH NOT SURE WHAT WE WERE TO DO; WE TOOK THE IMMEDIATE L TURN AND STOPPED TO CONFIRM EXACTLY WHAT WAS INTENDED. AT THAT POINT THE CTLR SIMPLY HAD TO ASK US TO CONTINUE TAXIING AND WE WOULD HAVE BEEN FINE AND OUT OF EVERYONE'S WAY; BUT HE CONTINUED A DIALOGUE EXPRESSING THE FACT THAT WE WERE GOING TO CREATE A GAR SIT. AT THAT POINT; WE TOLD HIM; OR ASKED HIM; IF THERE WAS ANYTHING WE COULD DO; IE; MAKE 180 DEG TURN OR WHATEVER TO RECTIFY THE SIT. NO RESPONSE WAS GIVEN AND AN AIRPLANE WAS TOLD TO GO AROUND. THERE WAS PLENTY OF TIME FOR US TO MOVE FORWARD IF WE WERE ASKED TO AND LOOKING BACK; I SHOULD HAVE CONTINUED TO BEYOND THE RWY MARKINGS; BUT IN TODAY'S CLIMATE; YOU DON'T WANT TO MAKE ANY MISTAKES. WE WERE THEN TOLD TO TAXI TO THE FBO AND CALL HIM WHEN WE GOT TO A PHONE. I CALLED AND EXPLAINED WHERE WE THOUGHT THE CONFUSION AROSE AND HE DIDN'T SEEM TO THINK THERE SHOULD HAVE BEEN ANY CONFUSION. HE INDICATED THERE WAS NO INCIDENT CREATED FROM THE EVENTS; BUT WANTED ME TO UNDERSTAND THE IMPORTANCE OF COMPLIANCE WHICH; OF COURSE; I ALREADY DID AFTER FLYING FOR 25 YRS. WE WERE TRYING TO ADHERE TO THE CTLR'S DIRECTION BUT IN TODAY'S CLIMATE; EVERYONE -- INCLUDING CTLRS AND PLTS -- IS SAYING TOO MUCH.