ACFT DID NOT CLR RWY WHEN USING TXWY.

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AFTER LNDG ON RWY 33 MY STUDENT AND I RECEIVED INSTRUCTIONS TO 'CONTACT GND ON 121.6; AND HOLD SHORT OF THE RAMP.' AS WE TURNED ON TO THE EXIT TXWY I SAW AN AIRPLANE TAXIING NBOUND THAT WOULD BE XING OUR EXIT L TO R. I HAD THE CTLS AND STOPPED SHORT OF THE HOLD LINES ON THE RWY SIDE ; CLEANED UP THE AIRPLANE AND TOLD MY STUDENT TO CONTACT GND. WHEN HE DID SO THE GND CTLR TOLD US THAT WE WERE SUPPOSED TO CROSS THE HOLD LINES BEFORE STOPPING; AND THEN CONTACT GND. FOR SOMETIME I'D BEEN THINKING THAT THE USAGE OF RAMP IN THIS INSTRUCTION IS AMBIGUOUS; RESEARCHED IT SOME; AND MEANT TO TALK TO THE TWR ABOUT IT. UNFORTUNATELY I CHOSE TO TALK TO THEM NOW! BEFORE RESEARCHING THE USAGE OF 'RAMP' I'D ALWAYS CROSS THE LINES AND THEN STOP. THE RESEARCH AND COMMENTS OF OTHER PLTS PRIMED ME TO STOP BEFORE THE LINES THIS TIME. I REALIZE THAT THIS WAS NOT THE TIME OR PLACE TO TELL THE GND CTLR THAT THIS USAGE OF RAMP WAS NON-STANDARD AND NOT IN THE PLT-CTLR GLOSSARY. I WAS NOT PROFESSIONAL. AFTER COMPLETING MY POST FLT BRIEFING I LEARNED THAT THE TWR HAD PHONED MY CLUB TO REITERATE THE MEANING OF THEIR INSTRUCTIONS. I WENT TO THE TWR AND TALKED TO THE CTLRS ABOUT THIS. I NOW KNOW MORE ABOUT THE LCL CONDITIONS THAT HAVE LED TO THIS USAGE; AND ALSO KNOW EXACTLY WHAT THE CTLR'S WANT. I'VE ALSO ARRANGED FOR THE TWR SUPVR TO BE ASKED TO WRITE AN ARTICLE FOR OUR CLUB NEWSLETTER ON THIS SUBJECT. HOWEVER; I STILL THINK USING 'RAMP' IN THIS CONTEXT IS NOT CLR. THIS USUALLY HAPPENS WHEN THERE IS TFC ON THE TXWY THAT WILL BE PASSING AN EXIT AREA. WHEN THIS IS NOT THE CASE; THE INSTRUCTION IS USUALLY 'CONTACT GND 121.6; LEAVING THE RWY.' I THINK SOMETHING LIKE 'EXIT THE RWY; GIVE WAY TO X-BOUND TFC; AND CONTACT GND 121.6' WOULD BE BETTER. (SOMEHOW THE FACT THAT THE TXWYS; UP TO THE RWY HOLD LINES AND THE PARKING AREAS ARE NON-MOVEMENT AREAS IS INVOLVED HERE. THE GND CTLRS INSTRUCTIONS ON 121.6 ARE ADVISORY ONLY.) I THINK AN ASRS ARTICLE LIKE 'TAXI TO' (NO 159) WOULD BE A BIG HELP; IF YOU HAVE ENOUGH RPTS OF SIMILAR INSERT SITS.